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In order to convert it, you will need to unlock it. Restricted documents cannot be saved as a text file. If you can’t highlight or copy any text, then the document has been restricted. Restricted documents are often protected against copying. Click the icon to see what is restricted. This is located at the top of the left bar if the document has security. If you don’t need a password to open the file, you can see if a file is secured by looking for the padlock icon. For highly-encrypted passwords, there is little chance that it can ever be cracked. This method is very CPU-intensive, and even the simplest passwords can take days to crack, leaving your computer unable to perform any other tasks during that time. If you need a password to open the file, then you will need to download encryption-breaking software. If you need to edit or copy text from a PDF file, but don’t have access from the owner, follow these steps to unlock the PDF file. The owner or creator of a PDF file can restrict user access, printing, text copying and document editing with password protection. A secure PDF file enforces copyright laws with features to prevent reproduction or distribution by other users.