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The only form of DRM that can be licensed by third parties is that from Adobe itself. Doing so involves a large setup fee, a maintenance fee of several thousand dollars a year, and extra fees for each book protected. In short, it's not even worth considering unless you plan to establish a large retail operation.
All forms of DRM can easily be circumvented, and are only effective in preventing casual copying by the technically inexperienced. The limitations on printing or copying that can be set in PDFs are even more ineffective unless the entire document is encrypted, and that can be broken as well.
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