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By using TeX <code>\special</code> commands, it is possible to directly insert "literal PostScript" into the DVI file and have such snippets of PostScript appear in the final file generated by <tt>dvips</tt>. This flexibility allows the user to include, say, watermarks on his document (especially via the use of proper packages<ref>http://www.ctan.org/tex-archive/macros/latex/contrib/eso-pic/</ref>) or further postprocess the PostScript file<ref><tt>[[pstricks]]</tt></ref>.
When producing postscript files, dvips embeds fonts inside the file. Most recent distributions will normally embed scalable fonts. Files generated with older distributions, however, may embed raster fonts. To substitute raster for scalable fonts in a postscript file in a situation where the original dvi file is unavailable use a utility called [[pkfix]].
==References==
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