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When a PDF is fully-locked, it does not allow anyone to view the file without its password. It’s important to know the type of PDF lock you’re looking at first, in order to determine how to unlock it. Typically, there are 2 main types of file locks: Document open password and Permissions password. The password-protection feature is available for different purposes depending on the reason for locking the PDF. What Is Password Protection? 2 Types of PDF Locks You Need to Know About
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