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I have set a user password, but only for editing and or extracting/printing the file. The idea is, that the file should be easy to use and the protection should be unobtrusive but the information in the file should not be removable.
The master password could be generated randomly or something because nobody would have to have access to the editing features, not even the "seller" of the files.
The really difficult part for this procedure is, that you'd have to have a system like the one Pitchfork describes that uses the information the Purchaser provides when ordering and injects it into the PDF the user then downloads.
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