You will need a PostScript interpreter, if you get PostScript, there is no alternative. You also need one that can produce a PDF file as output instead of a bitmap.
The only PostScript PostScript interpreter that still exists, to my knowledge, is Ghostscript, which is licensed under the GPL. You will need to determine if this license can be used by you.
Otherwise, there are several commercial alternatives. Ghostscript is also licensed commercially, and there are products from Global Graphics and Adobe.
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