Open a file in Acrobat and choose “Tools” > “Protect.” Select whether you want to restrict editing with a password or encrypt the file with a certificate or password. Set password or security method as desired. Click “OK” and then click “
In the Password Security Settings dialog box, set a Document Open password to create a password-protected PDF. Adding a password as a security method will prevent the file from being opened and viewed by anyone who finds the PDF.
Choose File > Protect Using Password, and then choose Advanced Password Protection from More Options. If you receive a prompt, click Yes to change the security. Select Restrict Editing And Printing Of The Document .
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