Postscript in printers is a page description language and the embodiment of that language on a chip inside a printer. It is an Adobe invention and protected by either copyright or patent law. Anyway, Postscript is open published code, and printer manufactures can choose to license from Adobe, or build their own interpreter based on the PS specifications to avoid the fee structures charged by Adobe. Some do a better job then others.
Generally, PostScript emulation tries to emulate the results of genuine PostScript technology, achieving a printed document that can be very close to the desired result. For most stuff, an emulation will just be as good as the original version. However, the emulation will never achieve results that are precisely the same as a genuine PostScript printer. Some have claimed that certain files fail in emulated PS that work in Adobe. But it is pretty rare case.
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