Protecting PDFs from Unlicensed Sharing

Hi all,
I'm aware Acrobat has many features around DRM and protecting documents from unlicensed usage. However, I want to know how scalable this is...for instance, if I'm selling training materials in PDF format, and someone purchases the materials to use for "20 users", are Acrobat's features alone sufficient to prevent this person from giving the materials to 30 users?
Any thoughts or solutions would be greatly appreciated!
Best,
Adam

Acrobat doesn't have that type of ability at all. The best you can do is to explore the security settings available under File>Properties>Security. Even then keep in mind that it's way easy to get around Adobe security.
What you need is a server side DRM solution.

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