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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?
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.
++ 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.