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DRM pdf is tricky especially if it's the encryption one (there is a milder version that restricts printing, copying of text to clipboard and similar stuff - this one is easily bypassed with Linux tools). Only reliable solution is to snag (copy your pdf screen as image file) and ocr. People reported various hacks by fiddling with a binary editor and changing this or that in the binary file, but nothing consistent...
Regarding pdf as a format, I hate it too for ebooks, though it's quite useful for documents, especially if you have filling rights in the document (presuming you do not have full Acrobat); unfortunately right now it beats all other ebook preferences in downloads, polls, you name it, it by a lot; that tells also something about ebooks and how they are used...
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