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by kccqzy
3275 days ago
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The PDF reference is freely available and pretty readable too. I would recommend just read that. To answer your question, subsetting a font just means taking a portion of its glyphs and it doesn't imply remapping. In fact for almost sane PDF files you will find ASCII characters mapped to themselves, making text search within decompressed PDF possible. My dirty watermark remover script basically uses qpdf to decompress the thing and then use regular expressions to search for Tj or TJ right after the specified string. |
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http://wwwimages.adobe.com/content/dam/Adobe/en/devnet/pdf/p...
This is a long document but it is very well written, if you read it on the bus or while you're waiting for your compiler to finish, you will get to understand it.