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A friend wants to copy protect his teaching material.

This need not be foolproof as his customers are not necessarily black-belt hackers.

I have the idea to include a not easily removable fingerprint into the files that identifies the customer: in case of an exemplar pops up on the Internet, my friend could identify who put it up.

What open source software would you recommend for this? Preferrably on Windows. The format is Microsoft Word .doc .

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    Is he giving the word file to his customer?
    – kenchew
    Jul 14, 2020 at 17:20
  • Yes, he would share the possibly different word files to his customers.
    – Gergely
    Jul 20, 2020 at 9:10
  • How about create a custom property? Most people don't check or know what a property is. support.microsoft.com/en-us/office/…
    – kenchew
    Jul 20, 2020 at 10:25

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