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How can I convert djvu to PDF on Mac OS X?
Apple isn’t required to open source MacOS because the Unix it is based on (BSD unix) comes under an open source license (the BSD license) which doesn’t (unlike the GPL license) mandate that derived works have to also be open source.
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However, Apple does have the obligation to release documentation of the underlying technology as per the Apple Computer Software Distribution Agreement (SDA) and is obligated to release source code for any of the macOS APIs: Apple File System, OS X, iCloud, Core Audio, Core Image, Core MIDI, Core Video, Core Services, Quartz Composer, Quartz Editor/Xcode, QuickTime (Quartz Composer is a built-in tool that Apple developed when the team developed Xcode), Photos, Security, Spotlight, Siri, Terminal, Time Machine, ICL, Core Data, OpenSSL, Core Spotlight, Core Text. For Apple to release a Mac operating system as open source has never been a given, though, even on Unix. What Apple can and does do now Apple can and does release macOS as open source. This is the decision of the Mac developer community to make in the open, not the decision of Apple. Apple has several reasons for why it won't release macOS as open source:.