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[ken]

They've certainly hired people to work on open-source projects and keep them open-source (e.g., LLVM, CUPS). What closed-source forks have they made?

[saagarjha → ken]

Apple keeps internal forks of projects where they can do so legally; it helps them prevent leaks and lets them add new features quicker. These changes often do end up getting merged back in, but this is usually after they have shipped.