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== Modern derivatives ==
[[Apple Computer|Apple]]'s [[Mac OS X]] operating system uses a central window server (created entirely by Apple) that caches window graphics as [[Portable Document Format|PDF]], instead of storing and executing PostScript code{{Citation needed|date=February 2018}}. A graphics library called [[Quartz 2D]] provides PostScript-style imaging using the PDF rendering model (a subset, plus tweaks, of the PostScript model), but this is used by application frameworks—there is no PostScript present in the Mac OS X window server. Apple chose to use this model for a variety of reasons, including the avoidance of licensing fees for DPS and more efficient support of legacy [[Carbon (API)|Carbon]] and [[Classic (Mac OS X)|Classic]] code; [[QuickDraw]]-based applications use bitmapped drawing exclusively. Adobe's copyright stipulations for the PDF standard are much less restrictive, granting conditional copyright permission to anyone to use the format in software applications free of charge.
== See also ==
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