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Good afternoon Adobe,
Is it possible to save pdf files as read only so that no one else can unlock the files for further editing?
Gregory.
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The best way to do that is to digitally sign the file, and also to apply a security policy for it that prevents editing AND requires entering a password to open it.
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++ Adding to the suggestion by try67
Please go through the help page https://helpx.adobe.com/acrobat/using/securing-pdfs-certificates.html for more information and know-how.
Regards
Amal