Rick Richardson writes to note a posting on cups.org that reveals that Apple, which in 2002 first licensed CUPS for printing in OS X, purchased the source code last February
and hired its main developer, Michael R. Sweet. Sweet writes: "CUPS will still be released under the existing GPL2/LGPL2 licensing terms, and I will continue to develop and support CUPS at Apple."
There are no comments on the post. What exactly did Apple purchase? It was and is an open source project. Trademarks aren't mentioned.