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> A DRM schema which manages the right of the authors to be paid
> without prevent "copying" of the files is possible.
Yep. Preventing copying, reproduction or recording - take these off the table and we are back in the realm of possible.
For completeness sake: the "official" wiki article on DRM does include watermarking as a DRM method. Entirely another can of worms there. Definitely less intrusive and something that can actually work in some circumstances. Sadly still no-go for e-books tho.
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