How can we lock pdf files and how to unlock it?
Password protection of your PDF file ensures that the PDF can only
be opened by the intended recipient of the file. Password protection can also
be used to prevent users from printing or editing the document. These settings
can be further tweaked to allow only low resolution printing, and varying
degrees of editing.
METHOD 1
To password protect your PDF document in Adobe Acrobat Reader,
go to Advanced > Security > Encrypt With Password.
A prompt will appear asking if you are sure you want to change the security settings. Click on Yes.
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