Inside every Intel Mac with a T2 chip, and every Apple silicon Mac, is a secure enclave, originally referred to as its security enclave. The subject of a flurry of Apple’s patents from 2012 onwards, this was introduced in the A7 chip inside the iPhone 5s and iPad mini 3, 12 years ago in September 2013, where it brought biometric authentication in Touch ID.
iPhone 5s
Protecting the most important secrets in a computer is a great challenge. No matter how secure you try to make the main processor and memory, as they’re exposed to direct attack, isolation can only be relative and temporary. An alternative approach is to move the most secure data and its processing into a secure enclave and its processor, and that’s the architectural solution chosen by Apple in what it patented as a security enclave, filed in September 2012, a year before its release in the iPhone 5s. Engineers credited for that patent are Manu Gulati, Michael J Smith and Shu-Yi Yu.
Successive iPhone chips steadily improved their secure enclaves, and by the time the iPhone 7 was introduced in September 2016, with its A10 Fusion chip, its secure enclave was handling encryption and authentication but not replay prevention. It also had EEPROM secure storage, and an AES engine with DPA protection and lockable seed bits. When the first Intel Mac with a T1 chip was released a couple of months later, that was based not on the A10 but the S2 used in the Apple Watch Series 2. The T1 thus doesn’t really have a secure enclave as such, although it supports Touch ID.
An early and thorough account of these secure enclaves was presented by Tarjei Mandt, Mathew Soling and David Wang at Black Hat USA in 2016. This appears to be the only such account apart from the section in Apple’s Platform Security Guide, most recently updated in December 2024. Apple’s engineers continued to gain new patents, covering trust zone support (filed in 2012), key management (filed in 2014), and most relevant to Macs, Pierre Olivier Martel, Arthur Mesh and Wade Benson’s patent for multi-user storage volume encryption, filed in 2020.
T2 chip
The first Macs with a true secure enclave are those with a T2 chip, starting with the iMac Pro in December 2017. Those are based on the same A10 Fusion chip from the previous year, and were already lagging the iPhone 8 in this respect.
The T2 secure enclave is another co-processor system, run by a Secure Enclave Processor (SEP), a 32-bit ARM CPU running its own operating system, sepOS, based on a specialised L4 microkernel completely different from those used by Macs and Apple’s devices. It has its own secure storage (EEPROM), and a Public Key Accelerator for signing and encryption/decryption using RSA and ECC methods. Outside the enclave is a dedicated AES256 encryption/decryption engine built into the data transfer path between the internal SSD and main system memory.
M-series chips
The big leap forward for Macs was the release of the first models featuring M1 chips, which caught up with the features of late versions (after autumn 2020) of the A12 and A13, with Apple’s second generation Secure Storage Component.
Perhaps the most significant of its improvements are measures to prevent replay attacks. Those are best illustrated with FileVault. Let’s say that you didn’t enable FileVault at first, but left your Apple silicon Mac to handle the encryption of its internal Data volume without the added protection of your password. That would mean that its volume encryption key (VEK) was generated internally by the Secure Enclave, and stored there. If you then turned FileVault on, the VEK would be encrypted using your password and the hardware key. In the T2 chip, it might be possible to use the old VEK to decrypt the volume. In the secure enclave of an M-series chip, that type of replay attack is prevented by the revocation of all previous events and records.
Other improvements include the use of second generation secure storage incorporating counter lockboxes to enforce limits on the number of passcode attempts allowed, instead of an EEPROM, and a better Public Key Accelerator.
Currently, the secure enclave is known to protect the following:
encryption keys for Touch ID, FileVault, and the Data Protection (iCloud) keychain (but not file-based keychains);
that Mac’s Unique ID (UID) and Group ID (GID);
Touch ID control, and (on older devices not Macs) Face ID using a secure neural engine; in recent devices and M-series chips, that’s implemented as a secure mode in the main neural engine (ANE);
Apple Pay handling;
Activation Lock, through the Owner and User Identity Keys;
signing and verification of LocalPolicy for boot environments (Apple silicon).
Communication between the CPU and SEP is performed using a dedicated mailbox whose function is detailed in Apple’s patents. Further information is also provided in the Platform Security Guide.
FileVault encryption
It has been stated widely (even here) that the secure enclave in T2 and Apple silicon chips contains a hardware encryption/decryption unit and acts as the internal SSD’s storage controller. In fact, as shown in the original patent of Martel and others, and now in the Platform Security Guide, the AES engine responsible is located outside the secure enclave, together with the Flash controller, and has a secure link to the enclave.
During SEP boot, it generates an ephemeral key to wrap keys to be used by the AES engine for encryption and decryption. That key is sent from the secure enclave to the AES engine over the dedicated connection between them, then used to protect keys transferred from the enclave to the AES engine. That ensures an unprotected key is never exposed outside the enclave and AES engine.
The Apple silicon secure enclave is by no means unique. ARM TrustZone, other Trusted Execution Environments, and Trusted Platform Modules offer similar features and facilities. However, the secure enclave is unusual because it has been integrated into all Macs with T2 or Apple silicon chips, and all Apple’s recent devices, and can’t be disabled or bypassed.
References
Manu Gulati, Michael J Smith and Shu-Yi Yu, US Patent 8,832,465 B2, Security enclave processor for a system on a chip, filed 25 September 2012, granted 9 September 2014.
R Stephen Polzin, James B Keller, Gerard R Williams, US Patent 8,775,757 B2, Trust zone support in system on a chip having security enclave processor, filed 25 September 2012, granted 8 July 2014.
R Stephen Polzin, Fabrice L Gautier, Mitchell D Adler, Conrad Sauerwald and Michael LH Brouwer, US Patent 9,419,794 B2, Key management using security enclave processor, filed 23 September 2014, granted 16 August 2016.
Pierre Olivier Martel, Arthur Mesh and Wade Benson, US Patent 11,455,432 B1, Multi-user storage volume encryption via secure processor, filed 8 June 2020, granted 27 September 2022.
Tarjei Mandt, Mathew Soling and David Wang (2016), Demystifying the Secure Enclave Processor, Black Hat USA 16 (PDF)
Apple, Platform Security Guide
Wikipedia’s overview of Apple silicon chips.
I hope that you enjoyed Saturday’s Mac Riddles, episode 322. Here are my solutions to them.
1: It’s about evolution, and open source for 25 years.
Click for a solution
Darwin
It’s about evolution (when Steve Jobs announced Darwin as open source in 1999, he said this to link it with Charles Darwin), and open source for 25 years (first released as open source in 2000, and still being posted on GitHub). (Darwin consists of the open source components in macOS, and includes its kernel.)
2: If the kernel isn’t Unix, this is it.
Click for a solution
XNU
If the kernel isn’t Unix, this is it (XNU is the open source kernel within Darwin, and is available as part of the GitHub distribution. Its name is an abbreviation for X isn’t Unix).
3: Mud puddles in Pittsburgh misheard as the basis for 2.
Click for a solution
Mach
Mud puddles in Pittsburgh misheard (it was originally intended to be called Muck in honour of these, but was misheard and incorrectly written down as Mach) as the basis for 2 (the Mach microkernel, developed by Richard Rashid and Avie Tevanian, formed the basis of XNU. Tevanian went on to work at Apple, then NeXT, where he designed NeXTSTEP).
When Mac OS X 10.0 was released in March 2001, privileges, permissions and security adopted a conventional model based on BSD and Unix. Those sufficed for 15 years until the release of OS X 10.11 El Capitan in September 2015, when System Integrity Protection, SIP, was introduced. This article outlines its history over the last decade.
2015 Introduction
The first public account of SIP was presented by Pierre-Olivier Martel at WWDC 2015 in June, and documented in Apple’s System Integrity Protection Guide that September, which hasn’t been revised since. These changes were justified as adding a further layer of security protection to prevent attackers from gaining full control by escalating privileges to root.
Three types of protection were promised:
file system protections, so that system files could only be modified by processes signed by Apple;
prevention of runtime attachment, code injection, or modification of system binaries, with modifications only permitted by Apple’s installers and updaters;
kernel extensions (kexts) had to be signed using special certificates granted by Apple.
Each Mac’s SIP configuration was stored in NVRAM, and controlled by the csrutil command used in Recovery mode.
When released, the csrutil command provided some degree of separate control over six groups of features: file system protections, debugging protection, DTrace protection, kext signing requirement, NVRAM and ‘Apple internal’ protection. One immediate beneficial side-effect was that SIP prevented permissions being changed for system files, and that made the practice of repairing permissions on them unnecessary, allowing removal of support for that procedure from Disk Utility.
2015 Conflicts
Press reviews of the SIP feature were divided, with some claiming it was a sign that OS X was being closed down and moved to the iOS security model, while others considered that few users would notice much difference.
Problems resulting from SIP were reported soon after El Capitan’s release. For example, some older Mac models intentionally prevented their use with Apple USB SuperDrives. One workaround to address that had been to modify one of the files now protected by SIP, which consequently required the user to disable SIP to make that change.
As kernel extensions hadn’t previously been required to be signed at all, other early casualties were all older unsigned kexts, making some apps unusable unless a new version was provided with a correctly signed kext.
2016 Error
Late in 2016, it became clear that Apple had shipped a substantial batch of new MacBook Pro systems with SIP disabled. At that time, System Information was unable to report SIP status, and the only way to enable protection was to start that Mac up in Recovery mode and use the csrutil command in the Terminal app there. That applied to macOS Sierra 10.12 to 10.12.1.
To make this easier, Apple changed csrutil so that it could enable SIP when invoked in normal running mode, provided it was run with elevated privileges obtained using sudo. Despite that, some of those affected MacBook Pro models didn’t have SIP enabled correctly for several months.
2017-18 Problems
Over the following years, SIP continued to cause irritations that infuriated some users.
Bundled apps in the main Applications folder were protected by SIP, and that prevented the user from modifying them. As the handling of kexts changed, it was discovered that SIP made it awkward to remove old kexts the user had installed. That was because the folder /Library/StagedExtensions was put under the protection of SIP by attaching a com.apple.rootless extended attribute to it.
One reading of that extended attribute is that only Apple’s KernelExtensionManagement service can give permission for changes to be made within that folder, and the folders within it.
2020 Extended attributes
Apple later used SIP to lock down individual extended attributes (xattrs) attached to regular unprotected files. The first example of this was the undocumented com.apple.macl xattr that macOS started to attach widely to all user documents. Presence of that xattr was implicated in some problems in which those documents became locked down and unable to save changes, despite permissions and other visible attributes showing that the user had full ownership of the file. The only workaround for this has been to copy the file to another volume, where the xattr no longer has the protection of SIP, and can be stripped.
When Apple later introduced another undocumented xattr com.apple.provenance, that too was sometimes but not always protected by SIP, although that hasn’t been implicated in problems visible to the user.
2022 Launch constraints
Launch constraints were introduced in macOS 13 Ventura and iOS 16 in 2022. Every executable binary in the system now has a set of rules determining the requirements for that binary to be launched. These include self constraints that the binary itself must meet, parent constraints that must be met by its parent process, and responsible constraints that must be met by the process requesting the launch. Together these form that code’s launch constraints. To make those constraints simpler, they come in different categories, ranging from 0, in which there are no constraints at all, to combinations that prevent launch by processes that aren’t themselves part of the system and require the code itself to be on the System volume.
Although Apple has documented these for developers, they can cause unexpected behaviour for users, who haven’t been given any explanation. Testing has demonstrated that launch constraints are dependent on SIP, so must be assumed to have been added to its list of protections.
2024 Malware scans
Many users have reported slowing app launch times in recent versions of macOS. In February 2024, Jeff Johnson investigated these, and concluded that the cause was the macOS security system repeatedly performed malware scans against a growing set of Yara rules. These stopped when SIP was disabled, implying that this is yet another protection that has been added to those controlled by SIP.
2024 Current protections
Current user documentation for SIP explains only its file system protection, csrutil‘s man page refers to its usage information, but from that and XNU it’s possible to separate out its controls to include the following, at least:
Filesystem Protections, disabled by CSR_ALLOW_UNRESTRICTED_FS, abbreviated to fs
Debugging Restrictions, disabled by CSR_ALLOW_KERNEL_DEBUGGER and CSR_ALLOW_TASK_FOR_PID, abbreviated to debug
DTrace Restrictions, disabled by CSR_ALLOW_UNRESTRICTED_DTRACE, abbreviated to dtrace
Kext Signing, disabled by CSR_ALLOW_UNAPPROVED_KEXTS, abbreviated in csrutil to kext
NVRAM Protections, disabled by CSR_ALLOW_UNRESTRICTED_NVRAM, abbreviated to nvram
Apple Internal, disabled in XNU by CSR_ALLOW_APPLE_INTERNAL, and only disabled when SIP is fully disabled
BaseSystem Verification, abbreviated to basesystem
Boot-arg Restrictions, disabled with nvram
Kernel Integrity Protections, disabled with kext
Authenticated Root Requirement, disabled by CSR_ALLOW_UNAUTHENTICATED_ROOT, managed separately using csrutil authenticated-root disable and enable
Additional configuration flags available in XNU that don’t appear to be directly supported by csrutil include: CSR_ALLOW_TASK_FOR_PID, CSR_ALLOW_DEVICE_CONFIGURATION, CSR_ALLOW_ANY_RECOVERY_OS and CSR_ALLOW_EXECUTABLE_POLICY_OVERRIDE. Those should be disabled when SIP is fully disabled.
2015-2025 Vulnerabilities
Over the last decade, many vulnerabilities have been discovered in SIP that have allowed parts of its protections to be bypassed. Among the most recent is CVE-2024-44243 discovered by Jonathan Bar Or (@yo_yo_yo_jbo) of Microsoft Threat Intelligence and Mickey Jin (@patch1t), and fixed in the update to macOS 15.2 Sequoia. However, this wasn’t fixed in Sonoma until the following round of updates (14.7.3), and appears to remain unpatched in Ventura 13.7.8.
Microsoft’s report explains how bypassing just one of SIP’s many protections can give access to bypasses of more or all of SIP’s other protections. Note also how Apple’s description of the vulnerability in its security release notes refers to StorageKit but doesn’t reveal that this affected SIP.
Over the last decade, SIP has grown like Topsy from three protections that seemed worthwhile and simple, into a protean collection of many parts that remain largely undocumented and pervade much of modern macOS security.
I hope that you enjoyed Saturday’s Mac Riddles, episode 321. Here are my solutions to them.
1: Where to sell an image of the Knolls in a two-year exclusive.
Click for a solution
Photoshop
Where to sell (a shop) an image (a photo) of the Knolls (originally developed by brothers Thomas and John Knoll, and licensed by Adobe) in a two-year exclusive (from February 1990 until its release on Windows in November 1992, it was exclusive to Mac).
2: Rembrandt, Claude Monet, JMW Turner and Corel.
Click for a solution
Painter
Rembrandt, Claude Monet, JMW Turner (all three were painters) and Corel (originally released in 1991 by Fractal Design, Painter was eventually bought by Corel).
3: One of the first two, it could be beige acrylic and written by Bill.
Click for a solution
MacPaint
One of the first two (together with MacWrite, it was one of the two apps bundled with the 128K Mac), it could be beige acrylic (paint the same colour as the 128K Mac) and written by Bill (Atkinson, 1951-2025, who wrote the app).
The common factor
Click for a solution
They have all been major raster graphics editors on the Mac.
Before the arrival of Mac OS X, our Macs had remained almost free from the property lists and other XML files that now seem to fill them. Those owe their origin to the grandfather of markup languages, SGML, originally known as Generalised Markup Language. That was invented by Charles Goldfarb, Ed Mosher and Ray Lorie in 1969, when they were working at IBM, as a means of structuring text semantically, and first used a different form of markup, as in :h1.Chapter 1: Introduction
to set that text as a top-level headline. Ordered lists should look familiar to anyone who writes HTML: :ol
:li.Item one.
:li.Item two.
:eol.
SGML was flexible as to markup formatting, but has become most widely seen using the angle brackets <> common to HTML, XML, and other markup languages.
Although it has never been popular in its own right, SGML still features in some products where markup is required to impart structure and meaning.
FrameMaker, originally developed by Frame Technology, is a high-end technical publishing system bought by Adobe in 1995. It was then offered in a premium version with extensive support for SGML, seen here in 2002, two years before Adobe dropped this Mac version.
XML
In 1996, a working group of W3C (the World Wide Web Consortium) started developing a profile of SGML that became known as Extended Markup Language, or XML. Work continued through 1997, and in February 1998 XML 1.0 was adopted as a W3C Recommendation. While there’s also a slightly different version 1.1, published in 2004, and various editions of 1.0, in its fundamentals the XML we use today is still version 1.0, with 1.1 only recommended for special purposes.
Property lists
Unlike traditional implementations of Unix, NeXTSTEP used its own property lists to contain serialised objects including settings. When Mac OS X was introduced, those were replaced by a new XML format using a public Document Type Declaration (DTD) still used today.
Although intended to be expressed in plain text, binary representations of XML developed during the early years of the new millennium, and Apple decided to adopt its own, bplist, in the early days of Mac OS X. This brought improved parsing speed, as well as being more compact, and has acted as a deterrent to those who might make casual changes to critical property lists. These were introduced in Mac OS X 10.2 Jaguar in 2002, and have been used as standard for property lists since Mac OS X 10.4. They are described well in this Wikipedia article.
A typical modern property list coded in XML might read <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
<date>2017-10-10T13:13:43Z</date>
</array>
</plist>
That specifies a datestamp in an extended attribute.
Tools
Bundled tools to create and edit property lists have remained disappointingly primitive, but there has been no shortage of contenders from third parties.
This is the ElfData XML Editor, one of the first to be released in 2001, seen two years later in Mac OS X 10.2 Jaguar editing DocBook XML format.
In 2004, David Reitter created a version of GNU Emacs with an Aqua interface and named it Aquamacs. It’s seen here in 2006, in Mac OS X 10.4 Tiger, with its XML tools for editing a property list.
Another early entrant, from 2002, that has blossomed into one of the most extensive and sophisticated XML development environments is cross-platform Oxygen, from SyncRO Soft. Although written in Java its Mac versions have been sensitively implemented. It’s seen here in Mac OS X 10.4 Tiger in 2006, viewing an XML rendition of Shakespeare’s Hamlet.
This is Syntext Serna in 2007, again in Mac OS X 10.4 Tiger, seen editing an XML version of my PhD thesis that had originally been written in Adobe FrameMaker+SGML.
Other editors came and went, such as XML Editor, here in the last few days of Mac OS X 10.4 Tiger in 2007. This is a table from my thesis.
Major text editors also gained XML powers. These are Safari’s preferences in Mac OS X 10.5 Leopard, seen rendered by Rich Siegel’s BBEdit. He first distributed this text editor for System 6 back in 1992, and over 30 years later it remains one of the few high-end text editors for macOS.
My final example returns to the specialist features in Oxygen, seen here in Mac OS X 10.7 Lion in 2012, where it’s being used with a botanical flora.
Today XML and property lists remain at the heart of macOS, something I doubt that Charles Goldfarb ever dreamed of back in 1969.
References
Charles F Goldfarb (1996) The Roots of SGML – A Personal Recollection, Wayback Machine SGML on Wikipedia XML on Wikipedia Property lists on Wikipedia
To make its graphical interface work, the Mac needed a high-performance graphics system, for which the late Bill Atkinson (1951-2025) and Andy Hertzfeld designed and implemented QuickDraw. When it came to driving printers, though, Steve Jobs licensed the new page description language PostScript from Adobe, where it had just been developed by John Warnock (1940-2023), Charles Geschke (1939-2021) and others. PostScript is a stack-based interpreted language that could take many seconds or even minutes to image a page for printing, so wasn’t practical for doing much else at that time.
In the early 1990s, as desktop publishing became dominant among Mac users and we were all sending one another faxes, several companies recognised the need for a universal document format that could display laid-out text and graphics. Among them was Adobe, where Warnock formulated the aims of what he then referred to as Interchange PostScript or IPS, and so led the development of Portable Document Format. It’s telling that the final sentence of his proposal reads: “In any event corporations should be interested in site-licensing arrangements.”
When the first version of PDF was released in 1993, with its Carousel reader app, it faced competition from other similar ideas, and Adobe found itself competing against products including Farallon’s Replica, and Tumbleweed’s Envoy that gained the support of WordPerfect, then a popular cross-platform word processor. PDF didn’t become dominant until Adobe distributed its reader app free, rather than charging $50 for it as it had initially.
For many years, the only way to create really good PDFs was using Adobe’s Acrobat Distiller app, costing $695 for a single-user licence. That ingested PostScript files, created on the Mac by printing to a file, and transformed them into PDFs that could in turn only be read using Adobe’s software. Although PostScript was by then a prerequisite for all publishing work on Macs, it wasn’t until 1996, when PDF reached version 1.2 in Acrobat 3.0, that it captured the prepress market, which it consolidated in 1998 with the PDF/X-1 standard.
This is Acrobat Distiller 4.0 running on Mac OS 9.1 in early 2001, showing a few of its bewildering array of options for turning PostScript files into PDF.
At the same time, John Warnock’s aspirations for success in enterprise markets were being realised, and PDF steadily became the standard for fixed-format electronic documents, with the support of the US Internal Revenue Service and Adobe’s free cross-platform Acrobat Reader.
When Steve Jobs established NeXT in 1985 he must have become the only person to have licensed PostScript from Adobe twice, as NeXTSTEP adopted Display PostScript as the centrepiece of its graphics, developed collaboratively between NeXT and Adobe. At the time many thought this to be a mistake, as PostScript isn’t as efficient a graphics language as QuickDraw, despite Adobe’s efforts to accelerate it.
When NeXT and Mac merged to form the beginnings of Mac OS X in 1997, Display PostScript was replaced with PDF as the central graphics standard for both display and printing, in what was dubbed Quartz 2D. This was first demonstrated at WWDC in 1999 and lives on today in macOS. At the time, Apple’s in-house PDF engine in Quartz was one of few, alongside Adobe’s.
Prior to Mac OS X, Adobe Acrobat, both in its free viewer form and a paid-for Pro version, had been the de facto standard for reading, printing and working with PDF documents on the Mac. The Preview app had originated in NeXTSTEP in 1989 as its image and PDF viewer, and was brought across to early versions of Mac OS X, where it has remained ever since.
This PDF shows Apple’s original iPod promotional literature from late 2001.
Adobe continued providing its free Acrobat Reader for Mac OS X, here seen in 10.0 Cheetah.
The full paid-for version of Adobe Acrobat provided an extensive suite of editing tools, here in Mac OS X 10.1 Puma in early 2002.
By Mac OS X 10.3 Panther in 2003, Apple was claiming that Preview was “the fastest PDF viewer on the planet”, capable of navigating and searching text within PDF documents “at lightning speed”. This worked with the Mac’s new built-in support for faxing, which rendered received faxes in PDF to make them easier and clearer to access.
This is an early Keynote Quick Reference guide from 2003, viewed in Preview.
At that time, Preview was also able to convert Encapsulated PostScript (EPS) files and raw PostScript to PDF, so they could be saved in the more accessible format, and printed easily.
This page from the 9/11 Commission Report of 22 July 2004 is being viewed in Preview.
Acrobat Distiller remained an important component in Adobe’s paid-for product, even though Mac OS X was capable of generating its own PDFs. It’s seen here in Mac OS X 10.4 Tiger in 2005.
This is Acrobat Pro in 10.4 Tiger in early 2006, showing its long list of supported export formats.
Since those heady days, Preview has been relatively neglected. Revision of both the Quartz PDF engine and its API brought a spate of bugs that only abated with macOS Sierra. Preview has adopted an uncommon model for PDF annotations that often doesn’t work well with other PDF products, but it has remained very popular for completing electronic forms. Then, in macOS Ventura, Apple removed all support for converting EPS and PostScript to PDF, most probably as a result of security concerns, and their progressive disuse.
Although rumours of the death of Preview continue to prove unfounded, it’s unlikely to feature again as one of the strengths of macOS.
I hope that you enjoyed Saturday’s Mac Riddles, episode 319. Here are my solutions to them.
1: Successor to 3 inside a scheme was part of a popular atelier.
Click for a solution
InDesign
Successor to 3 (Adobe developed it to replace the ailing PageMaker) inside (in) a scheme (a design) was part of a popular atelier (for many years it was one of the leading apps in Adobe’s Creative Studio).
2: High speed subatomic particle took the lead in the 1990s.
Click for a solution
QuarkXPress
High speed (express) subatomic particle (a quark) took the lead in the 1990s (by the mid-1990s it had taken around 90% of the desktop publishing market on Macs).
3: Creator of a squire’s assistant was the first, but died before Mac OS X.
Click for a solution
PageMaker
Creator (maker) of a squire’s assistant (a page) was the first (released in July 1985 for the Mac), but died before Mac OS X (by 2000, it was moribund as Adobe was replacing it with InDesign, released in 1999, and it was never ported to Mac OS X).
The common factor
Click for a solution
They have all been leading desktop publishing apps for Macs.
Since writing A brief history of local search, I have come across numerous patents awarded to Apple and its engineers for the innovations that have led to Spotlight. This more detailed account of the origins and history of Spotlight uses those primary sources to reconstruct as much as I can at present.
1990
ON Technology, Inc. released On Location, the first local search utility for Macs, a Desk Accessory anticipating many of the features to come in Spotlight 15 years later. This indexed text found in the data fork of files, using format-specific importer modules to access those written by Microsoft Word, WordPerfect, MacWrite and other apps of the day. Those files and their indexed contents were then fully searchable. This required System Software 6.0 or later, and a Mac with a hard disk and at least 1 MB of RAM. It was developed by Roy Groth, Rob Tsuk, Nancy Benovich, Paul Moody and Bill Woods.
1991
Version 2 of On Location was released. ON Technology was later acquired by Network Corporation, then by Symantec in 2003.
1994
AppleSearch was released, and bundled in Workgroup Servers. This was based on a client-server system running over AppleShare networks. September’s release of System Software 7.5 introduced a local app Find File, written by Bill Monk.
1998
Sherlock was released in Mac OS 8.5. This adopted a similar architecture to AppleSearch, using a local service that maintained indexes of file metadata and content, and a client app that passed queries to it. This included remote search of the web through plug-ins working with web search engines, as they became available.
Early patent applications were filed by Apple’s leading engineers who were working on Sherlock, including US Patent 6,466,901 B1 filed 30 November 1998 by Wayne Loofbourrow and David Cásseres, for a Multi-language document search and retrieval system.
1999
Sherlock 2 was released in Mac OS 9.0. This apparently inspired developers at Karelia Software to produce Watson, ‘envisioned as Sherlock’s “companion” application, focusing on Web “services” rather than being a “search” tool like Sherlock.’
2000
On 5 January, Yan Arrouye and Keith Mortensen filed what became Apple’s US Patent 6,847,959 B1 for a Universal Interface for Retrieval of Information in a Computer System. This describes the use of multiple plug-in modules for different kinds of search, in the way that was already being used in Sherlock. Drawings show that it was intended to be opened using an item on the right of the menu bar, there titled [GO-TO] rather than using the magnifying glass icon of Sherlock or Spotlight. This opened a search dialog resembling a prototype for Spotlight, and appears to have included ‘live’ search conducted as letters were typed in.
Mac OS X Jaguar brought Sherlock 3, which many considered had an uncanny resemblance to Watson. That resulted in acrimonious debate.
2005
In preparation for the first Intel Macs, Mac OS X 10.4 Tiger, released in April 2005, introduced Spotlight as a replacement for Sherlock, which never ran on Intel Macs.
Initially, the Spotlight menu command dropped down a search panel as shown here, rather than opening a window as it does now.
2006
On 4 August, John M Hörnkvist and others filed what became US Patent 7,783,589 B2 for Inverted Index Processing, for Apple. This was one of a series of related patents concerning Spotlight indexing. Just a week later, on 11 August, Matthew G Sachs and Jonathan A Sagotsky filed what became US Patent 7,698,328 B2 for User-Directed search refinement.
A Finder search window, precursor to the modern Find window, is shown in the lower left of this screenshot taken from Tiger in 2006.
2007
Spotlight was improved in Mac OS 10.5 Leopard, in October. This extended its query language, and brought support for networked Macs that were using file sharing.
This shows a rather grander Finder search window from Mac OS X 10.5 Leopard in 2009.
2014
Search attributes available for use in the search window are shown here in OS X 10.9 Mavericks, in 2014.
In OS X 10.10 Yosemite, released in October, web and local search were merged into ‘global’ Spotlight, the search window that opens using the Spotlight icon at the right end of the menu bar, accompanied by Spotlight Suggestions.
2015
John M Hörnkvist and Gaurav Kapoor filed what was to become US Patent 10,885,039 B2 for Machine learning based search improvement, which appears to have been the foundation for Spotlight Suggestions, in turn becoming Siri Suggestions in macOS Sierra. Those were accompanied by remote data collection designed to preserve the relative anonymity of the user.
This shows a search in Global Spotlight in macOS 10.12 Sierra, in 2017.
c 2019
Apple acquired Laserlike, Inc, whose technology (and further patents) has most probably been used to enhance Siri Suggestions. Laserlike had already filed for patents on query pattern matching in 2018.
I’m sure there’s a great deal more detail to add to this outline, and welcome any additional information, please.
4 August 2025: I’m very grateful to Joel for providing me with info and links for On Location, which I have incorporated above.
I hope that you enjoyed Saturday’s Mac Riddles, episode 316. Here are my solutions to them.
1: From PageRank and 10^100 to a set of letters.
Click for a solution
Google
From PageRank (Google Search was founded on the patented PageRank algorithm for ranking search results) and 10^100 (its name is derived from the very large number googol, 10 to the power of 100) to a set of letters (in 2015 it restructured under the ownership of Alphabet Inc.).
2: A hooligan went from directory to search then declined into finance and news.
Click for a solution
Yahoo!
A hooligan (a yahoo) went from directory (it started as a curated web directory) to search (followed by a search engine) then declined into finance and news (what now remains).
3: After changing name three times, this directory has gone wavy.
Click for a solution
DMOZ
After changing name three times (originally GnuHoo, it then became NewHoo, almost ZURL, next Open Directory Project, before becoming DMOZ), this directory (it was a human-curated web directory) has gone wavy (DMOZ was superseded by Curlie in 2018).
Depending on where you were, public Internet access first came in the early 1990s. Before that there were dial-up bulletin boards accessed using a modem.
The first of those bulletin boards (BBS) went online in Chicago in 1978, thanks to the pioneering work of Ward Christensen and Randy Suess. Those were joined by FidoNet BBSes in 1984-85, developed by Tom Jennings in San Francisco. Here in the UK one of the earliest was Compulink Information Exchange, founded by Frank and Sylvia Thornley. That went commercial as CIX in 1987, and the following year brought the first public access in the UK to limited Internet services such as email and Usenet.
Following discussions on CIX, Cliff Stanford (1954-2022) and his business partners Grahame Davies and Owen Manderfield set up the UK’s first public Internet service, Demon Internet, in a scheme originally known as tenner a month, or TAM. This was founded on the strength of 200 initial subscribers each paying £10 per month a year in advance from 1 June 1992. Demon grew rapidly to reach more than 50,000 subscribers, following which it was bought by Scottish Telecom in 1997, and two years later was demerged and became a public-traded company Thus plc.
At this time, Apple employees and third-party developers communicated using an integrated email system, AppleLink, a service operated by a descendant of General Electric (GE), one of the early computer manufacturers, GE Information Services Company, or GEISCO. Apple’s Internet presence expanded as AppleLink shut down in 1997. GEISCO went on to become GEnie, and died quietly with the new millennium.
Dial-up
Dedicated connections over ADSL were still prohibitively expensive for most users. Like most landline phone calls, online charges were highest during the day, and fell after 6 o’clock in the evening. Most nights the race would be on to see who could connect to their Internet provider before they ran out of incoming phone lines, and you’d have to wait an hour or two before one became available. The following screenshots walk through establishing an Internet connection using Mac OS 8.6 or 9.x with TCP/IP and Remote Access control panels, in 2001.
Armed with your ISP’s instructions and connection details (phone numbers, log on sequences, etc.), open the Modem control panel and check it’s configured correctly (port/internal, modem type). Then open the TCP/IP control panel, and use the Edit/User Mode menu command to display this dialog.
Changing user mode increases the scope of the TCP/IP dialog. In most cases, switch the upper pop-up menu to PPP (the protocol you’ll use to access your ISP), and configure the next pop-up down to Using PPP Server. Some ISPs may instruct differently. Other boxes should only be completed if advised – IP addresses of name servers, for instance. Some ISPs may advise you of a ‘hosts’ file (specifying IP addresses for services such as mail and news), which can be read in by clicking the Select Hosts File button.
Click on the Options button and ensure that TCP/IP is made active. If you can spare the memory, uncheck the Load Only When Needed box, to save memory fragmentation. Using the File/Configurations menu command, name and save these TCP/IP settings so they can be recalled readily. Then quit the control panel.
You should normally access your ISP through the Remote Access control panel, which needs to be set up with the access phone number, your user name (normally the first part of your Internet domain name, allocated by your ISP), and password. Unless you fancy typing your password in every time (or have security problems such as children!), let it save your password.
Click on the Options button to set other important features of Remote Access. Some ISPs require a full script to log on each time, in which case you must obtain a copy from the ISP, and install the script here, for a command-line host. This is unnecessary for most ISPs, thankfully. Avoid checking the top option, of connecting whenever you start TCP/IP applications, as it can cause untold aggravation each time you start your Web browser, for instance. Set any other options, and click on OK.
Finally, set up your email software, browser, and other Internet applications. In recent versions of Mac OS, Apple provides the Internet control panel as an easy way to do this – details entered here, particularly for incoming and outgoing mail, should apply to all compliant applications. Then re-open Remote Access and your applications, and click on Connect.
Mobile
Even if you were fortunate enough to have a mobile phone in those days, they had to use dial-up Internet connections too. So what did we do when we were on the road with a PowerBook G4, or the modem couldn’t connect? We connected to the Internet via a Bluetooth dongle and mobile phone. This next sequence of screenshots explains how to manage this technological feat. The phone I was using at the time was a brand new Ericsson T68, with a display resolution of 101 x 80 in 256 colours, no camera, but the novelty of predictive text. My Mac was running Mac OS X 10.1.x or later, with Apple’s Bluetooth support software (bundled in 10.2 Jaguar), an Apple-supplied D-Link USB Bluetooth transceiver, and Bluetooth-equipped mobile phone with airtime facilities and contract (e.g. GPRS).
Install the Bluetooth software (10.2 already has support) and connect your USB adaptor to a port on your Mac. A new pane appears in System Preferences, Bluetooth. Click to open it and check the Discoverable and Show Bluetooth Status items. Enter the Bluetooth control section of your phone’s menus, turn Bluetooth on, then set your phone to Discover. Authenticate using the same number, 1111 perhaps, on each, and they should pair.
Once paired, and that can sometimes prove a bit fiddly, your phone knows your Mac by its AppleShare computer name, and your Mac knows the phone by its name. Re-pairing in the future should be simpler, but follows the same basic sequence of making your Mac discoverable, letting the phone discover it, then completing the pairing. Switch your phone’s Bluetooth to automatic to save battery power when not paired.
Click on the Network pane, and using the Active Network Ports popup item turn off other connections apart from bluetooth-modem. Configure that connection to use PPP in the TCP/IP pane. Switch to the PPP pane, and enter connection details provided by your phone network. The phone ‘number’ to dial is a special series of characters, set by the network, and you may need to set PPP Options too.
In the Modem pane, select an appropriate phone from the popup Modem list. Although using an Ericsson T68 here, the closest listed is the T39 running at 28.8 Kbps (not Mbps). You may have to try out different modem setting scripts to see which works best with your particular phone, network, and airtime contract. You can also create your own connection scripts using Modem Script Generator.
Apply the changes to Network now, and open the Internet Connect application. Ensure that the correct configuration is selected, and check the details again. When you’re happy, and confident that your phone is within Bluetooth signal range and has a good phone signal strength (if using GPRS, ensure that its signal is strong rather than the regular GSM voice signal), click on the Connect button.
Once your connection is established you can browse the Web, collect and send email, and use all the facilities of the Internet from your Mac. Connection speeds are inferior to those made over telephone wires, though, and pedestrian compared with broadband. The menubar status holds a popup menu for ready access to key applications. Click on Internet Connect’s Disconnect button when finished.
Finally, in case you hadn’t already gathered, these were really slow Internet connections, and even small downloads could take several hours, if you weren’t disconnected. But there were times when software played tricks to amuse us. Here’s a screenshot of me trying to download and install the 14.4 MB update via Demon, to take Mac OS X 10.1 Puma to version 10.1.1 in November 2001, claimed to take 11,643 days at 44 Kbps.
I hope that you enjoyed Saturday’s Mac Riddles, episode 315. Here are my solutions to them.
1: It came with a tumbler from Camelot in 1993, then opened in 2008.
Click for a solution
PDF
It came with a tumbler (an acrobat) from Camelot (its original internal name) in 1993 (first released on 15 June 1993), then opened in 2008 (when it was adopted as an open ISO standard).
2: Replacement for 3 to avoid royalties with transparency has just turned three.
Click for a solution
PNG
Replacement for 3 (it was developed by Thomas Boutell and others to replace GIFs) to avoid royalties (those were imposed on GIFs because of their use of LZW compression) with transparency (it supports a transparency layer) has just turned three (its latest version 3.0 was released in June this year).
3: CompuServe animated its palette with 256 colours but we still can’t agree how to say it.
Click for a solution
GIF
CompuServe (released by CompuServe in 1987) animated (it supports animated images) its palette with 256 colours (it only supports palettes with 256 colours) but we still can’t agree how to say it (there has been a long-running dispute as to whether its ‘g’ is hard like ‘gift’ or soft like ‘gin’).
The common factor
Click for a solution
They were each intended to be portable, universal file formats.
Searching the Internet, more recently its web servers, has proceeded in four main phases. Initially, humans built structured directories of sites they considered worth visiting. When those couldn’t keep pace with the Internet’s growth, commercial search engines were developed, and their search results were ranked. Around 2000, Google’s PageRank algorithm became dominant for ranking pages by their popularity. Then from late 2024 that is being progressively replaced with AI-generated summaries. Each of these has been reflected in the tools provided by Mac OS.
Directories
In the earliest years of the Internet, when the first web servers started to appear, and files were downloaded using anonymous FTP, users compiled their own lists by hand. Some curated directories were made public, including one maintained by Tim Berners-Lee at CERN, and another at NCSA. Individuals started using Gopher, a client to discover the contents of servers using the service of the same name. The next step was the development of tools to catalogue Gopher and other servers, such as Veronica and Jughead, but it wasn’t until 1993 that the first search engine, W3Catalog, and a bot, the World Wide Web Wanderer, started to transform Internet search.
Berners-Lee’s directory grew into the World Wide Web Virtual Library, and still exists, although it was last updated several years ago, most is now hosted elsewhere, and some is broken. The most famous directory was originally launched in 1994 and was then known as Jerry and David’s Guide to the World Wide Web, later becoming Yahoo! Directory. This offered paid submission and entry subscriptions, and was closed down at the end of 2014.
The favourite of many (including me) was launched as GnuHoo in 1998, and later that year, when it been acquired by Netscape, became the Open Directory Project, then DMOZ, seen here in the Camino browser in 2004. Although owned by AOL, it was maintained by a volunteer community that grew rapidly to hold around 100,000 links maintained by about 4,500 volunteers, and exceeded a million links by the new millennium. DMOZ closed in 2017 when AOL lost interest, but went on as Curlie using the same hierarchy.
Sherlock was first released in Mac OS 8.5 in 1998. As access to the web grew, this came to encompass remote search through plug-ins that worked with new web search engines.
Those were expanded in Sherlock 2, part of Mac OS 9.0 from 1999 and shown above, and version 3 that came in Mac OS X 10.2 Jaguar in 2002.
Indexing and ranking
Human editors couldn’t keep pace with the growth of the web, and demand grew for searching of indexes. This posed the problem of how to rank pages, and development of a series of ranking algorithms, some of which were patented. The first to use links (‘hyperlinks’) was Robin Li’s RankDex, patented in 1996, two years before Sergey Brin and Larry Page’s PageRank that brought their success in Google.
Ranking search results wasn’t new. In the late twentieth century, sciences started measuring the ‘impact’ of published papers by counting their citations in other papers, and university departments and scientific journals laid claim to their greatness by quoting citation and impact indexes. Early search ranking used features such as the frequency of occurrence of the words in the search term, which proved too crude and was manipulated by those trying to promote pages for gain. The obvious replacement was incoming links from other sites, which also quickly became abused and misused.
Research into networks was limited before 1998, when Jon Kleinberg and the two founders of Google entered the field. As with citation indexes before, they envisaged link-based ranking as a measure of popularity, and popularity as a good way of determining the order in which search results should be presented. They also recognised some of the dangers, and the need to weight incoming links to a page according to the total number of such links made by each linking site. Oddly, Kleinberg’s prior work wasn’t incorporated into a search engine until 2001, by which time Brin and Page were powering Google to dominance, and in June 2000 provided the default search engine for Yahoo!
This is Yahoo! Search seen in Firefox in 2007, by which time it was using its own indexing and search engine.
PageRank and algorithms
Google grew prodigiously, and became rich because of its sales of advertising across the web, a business dependent on promotion of its clients, something that could be achieved by adjusting its PageRank algorithm.
Although it’s hard to find now, at one time Google’s Advanced Search was widely used, as it gives more extensive control. Here it’s seen in Safari of 2011.
Google Scholar gives access to published research in a wide range of fields, and was introduced in late 2004. Here it’s seen in use in 2011, listing work that’s recently become topical again. Scholar doesn’t use the same PageRank-based algorithm for ranking its results, but does give substantial weight to citation counts.
When Apple replaced Sherlock with Spotlight in Mac OS X 10.4 Tiger in April 2005, web search defaulted to newly-arrived Safari and Google’s search engine. Its major redesign, in OS X 10.10 Yosemite in 2014, merged web and local search into Global Spotlight, the search window that opens from the Spotlight icon at the right end of the menu bar. That in turn brought Spotlight Suggestions, which became Siri Suggestions in macOS Sierra.
This shows a search in Global Spotlight in macOS 10.12 Sierra, in 2017.
Apple has never explained how Siri Suggestions works, although it appears to use machine learning and includes partial results from web search probably using Google. It offers a taste of what is to come in the future of Internet search.
Summarising
Google started the transition to using Artificial Intelligence in 2024, and that September introduced Audio Overview to provide spoken summaries of documents. This year has brought full AI overviews, in which multiple pages are summarised succinctly, and presented alongside links to the pages used to produce them. Although some can be useful, many are vague and waffly, and some blatantly spurious.
We’ve come a long way from Tim Berners-Lee’s curated directories, and PageRank in particular has transformed the web and more besides.
I hope that you enjoyed Saturday’s Mac Riddles, episode 314. Here are my solutions to them.
1: Expedition for a panther now in visionOS too.
Click for a solution
Safari
Expedition (a safari) for a panther (it was first bundled with Mac OS X Panther in 2003) now in visionOS too (it’s now bundled in visionOS).
2: Polished plate is now 1’s most serious competitor.
Click for a solution
Chrome
Polished plate (chrome) is now 1’s most serious competitor (on Apple’s platforms, it is Safari’s main competitor).
3: Web pet only lasted a year before the exploder.
Click for a solution
Cyberdog
Web (cyber) pet (dog) only lasted a year before the exploder (released in 1996, it was dropped the following year, for Microsoft Internet Explorer to become the bundled web browser in Mac OS X).
Although taken for granted now, Apple didn’t release the first version of Safari until January 2003. Before that was a succession of interesting experiments to try. Those started with Netscape Navigator in 1994, which lasted until 2007, although by then it was little used on Macs.
Netscape is seen here in 2000, following my successful purchase of downloadable versions of Conflict Catcher and Suitcase from Casady & Greene’s online store.
Two years later, and I’m browsing Amazon’s listing of my never-published book that was slated for 31 March the following year. I’m so glad I never pre-ordered it.
Netscape had been at the front of browser development, leading with on-the-fly page display, cookies and JavaScript. But in 1996, it was challenged by Microsoft’s Internet Explorer, and Apple’s more innovative Cyberdog. The latter was sadly abandoned the following year, leaving the way clear for Apple to replace the bundled Netscape with Internet Exploder, as it quickly became nicknamed.
This is Microsoft Internet Explorer in 2001, providing the front end to Mac OS X Server through Webmin.
Cookie settings in Explorer were highly detailed in 2005.
Many of us abandoned Internet Explorer for alternatives such as Camino. That had originated within Netscape as Chimera in 2002, based on its Gecko layout engine, with a native Mac OS X front end. The following year it was rebranded as Camino, and amazingly lasted until 2012.
There were other competitors, such as Omni Group’s OmniWeb, which had been developed for NeXTSTEP since 1995, then moved to Mac OS X until 2012.
This is OmniWeb in 2007, showing the different browsers it could identify itself as, including a single version of Safari 1.0.
In January 2003, Apple launched the first beta-release of its own browser, Safari, and bundled it in Mac OS X 10.3 Panther when it was released that October. Since then Safari has been a regular fixture in successive versions of Mac OS X, OS X, and macOS. For several years, it was the only browser on iOS and iPadOS.
This is Safari 1 showing the front page for Apple’s developer site in 2004, complete with the offer to download Xcode version 1.5 with dead code stripping as a new feature. That year, Mozilla Firefox was released as an alternative, and has continued to support Macs ever since.
Mac OS X 10.4 Tiger came with Safari as the only bundled browser when it was released in April 2005, although it took Safari 2.0.4 in early 2006 before it was stable.
Page loading was slow in 2005, when Apple’s front page took a total of over 16 seconds to load fully, but that only used 6.8 MB of memory. By contrast, today Apple’s front page only takes a couple of seconds but requires over 200 MB.
There were times when the only way ahead with these early versions of Safari was to completely reset it, emptying its cache, and even removing all passwords and AutoFill text. This is Safari 2 in 2006.
Prominent among the plugins in 2006 was the dreaded Shockwave Flash, which had only recently been taken over by Adobe when it acquired Macromedia the previous year. Details of plugins are here being displayed on an internal web page within Safari 2.
Safari 3, bundled in Mac OS X 10.5 Leopard in October 2007, brought the claim that it was then the fastest browser, but it was troubled by bugs and security problems at first.
Safari 3 had already grown extensive preferences, covering the use of plugins, Java, JavaScript and cookies, seen here in 2007.
Its successor, Safari 4, followed in the summer of 2009, ready for Mac OS X 10.6 Snow Leopard, with further performance improvements, particularly in its JavaScript engine.
By 2009, Safari 4 was able to warn the user if it was about to visit a site blacklisted by the Google Safe Browsing Service. At least when that service was available. That year also saw Preview and Beta releases of Google Chrome, now Safari’s most serious competitor on Apple’s hardware.
Safari 5 was released a year later, in 2010, and was bundled in Mac OS X 10.7 Lion in 2011. This brought Reader mode and opened the door to third-party extensions.
Safari’s hidden Debug menu provided a collection of tools for web developers, and more recently has become the even more extensive Develop menu.
By the release of macOS 10.12 Sierra in 2016, Safari had reached version 10.
By 2016, close control over Adobe Flash Player had become critical, as a result of its frequent exploits, although it remained highly popular with content developers before Adobe finally killed it at the end of 2020.
Since 2021, with the release of macOS 12 Monterey, Safari 15 and its successors have been able to perform on-the-fly translation, as demonstrated here.
Safari is now the bundled browser in macOS, iOS, iPadOS and visionOS, and this year is set to leap in version number from 18 to 26 with the arrival of Tahoe and its sister OSes. It has been a long and sometimes troubled journey over those 22 years, and despite strong competition from Google Chrome and Chromium-based browsers, it remains the browser of first choice for a great many using Apple’s hardware products. I hope my screenshots have brought back more happy memories than traumatic moments.
I hope that you enjoyed Saturday’s Mac Riddles, episode 313. Here are my solutions to them.
1: Light and lenses control a car inside Macs until 2013.
Click for a solution
Optical drive
Light and lenses (optical) control a car (to drive) inside Macs until 2013 (they were fitted internally in Macs until 2013 models, with the last being in the MacBook Pro 13-inch mid-2012 that wasn’t discontinued until 2016).
2: Splendid campaign originally for airs until last August.
Click for a solution
SuperDrive
Splendid (super) campaign (drive) originally for airs (this external optical drive was first intended for MacBook Airs) until last August (they were discontinued in August 2024).
3: Cupertino’s Roman 400 in South Carolina was the first in 1988.
Click for a solution
AppleCD SC
Cupertino’s (Apple) Roman 400 (in Roman numerals, CD) in South Carolina (abbreviated to SC) was the first in 1988 (it was Apple’s first tray-loading CD-ROM reader, available between 1988-91).
The common factor
Click for a solution
They’re all optical drives that have been sold by Apple.
I hope that you enjoyed Saturday’s Mac Riddles, episode 312. Here are my solutions to them.
1: Border lake claims it’s both 10 and 1A.
Click for a solution
Tahoe
Border lake (Lake Tahoe is on the border between California and Nevada) claims it’s both 10 and 1A (depending on where you look, it reports it’s version 16, 10 in hexadecimal, or 26, 1A in hex).
2: Clearly a new material comes with concentricity.
Click for a solution
Liquid Glass
Clearly (it uses transparency) a new material (as Apple describes it) comes with concentricity (markedly rounded corners are an obvious feature).
3: Patented in 1876, it’s finally on its way to our Macs.
Click for a solution
Phone
Patented in 1876 (the telephone was patented then by Alexander Graham Bell), it’s finally on its way to our Macs (macOS Tahoe introduces the Phone app).
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