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wrap each chapter in a <div class="chapter"> and add a css style div.chapter:after to provide a visible watermark. additionally you can use the gimp to add a translucent watermark to your images. nearly impossible to remove once it's been done.
Along the veins of a GPG signature, there's a signatures.xml file. format is kinda complex, but you can use it. also, if you insist on using gpg and a .asc signature, you can sign a an entire folder or files inside a folder, then include the .asc file in the container without invalidating it.
Another possible way is to generate a few typos on accident change the to teh, or change other larger words by one inverted character, or one missed or extra. one or two per file. things not commonly typod, but still readable. keep a list of those typos. which file/chapter and which line. when you see someone using your files, you look in those files for those typos, and within a few lines either way. if you can't find them, then your adversary either did the work himself, or did a good job covering up his criem.
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