[dsspence]

Apple doesn't license PDF from Adobe even though it is part of OS X's native graphics renderer.

“The Quartz renderer and the PDF interpreter that Apple ships with Mac OS X are built with Apple code, with no external licenses, by Apple employees. Adobe just publishes a specification for how it’s supposed to function. This gives Apple considerably more flexibility with regard to what Quartz and the PDF interpreter can be used for.”

http://www.prepressure.com/pdf/basics/osx_quartz

[protomyth]

Steve Jobs learned from his experience with Adobe and the licensed version of Display Postscript. (see footnote 1 http://daringfireball.net/2008/02/flash_iphone_calculus )

[_b8r0]

Thanks to you and the parent commenter for a very insightful response.