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I want to protect the content of some PDF files (copy, edit, print).

I tried to use password protection but it can be broken easily using tools like this. Looks like they use standard encryption algorithms.

Is there any way to protect my files from editing? I don't want opening protection and I want to distribute this files to other people.

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I don't believe what you want is possible. Because anyone who has the ability to open a PDF has the ability to print and create one thus allowing them to modify it in any PDF editor. – Ramhound Apr 5 '14 at 19:06
UDC is an intuitive productivity solution that allows users to convert documents into PDF or image file formats for distribution, which means it protects the action of direct copy/edit. – mafap Jul 29 '15 at 2:59

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