Only unlock documents you own or are authorised to modify. This tool asks for the existing password - it does not crack or bypass protection. Removing someone else's protection may breach terms or law.
If the document still travels through shared email or drives, protection may be worth keeping. You can always re-apply a new password with Protect PDF after editing.
Check for a leading/trailing space when copying the password, confirm the exact case (passwords are case-sensitive), and make sure the file is really locked with an open password rather than only restricted permissions.
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