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Gzipped PostScript documents were fairly popular during the 90's and are functionally identical to PDFs for 99% of use cases. (PDF is essentially PostScript, but with more features.)



For Gzipped PostScript, code execution is its raison d'être. But it is at least possible to build a PDF viewer without code execution.


Well, both a simpler language more geared toward presentation, but also including more modern features designed for on-screen viewing.




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