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I've been given a PDF that is password-protected. I have the document-open password, which is enough to decrypt the contents and allow PDF readers to load the content correctly.

Is there a command-line tool that will perform this decryption process (based on the provided password) and write the decrypted PDF to a new file?

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Yes. Qpdf should do what you want:

qpdf --password=thepassword --decrypt input.pdf output.pdf

You can find a download for Windows (assuming you have MinGW installed) if you go to Files->qpdf->latest version, then scroll down to find a description of the files (you can find a link to version 5.11, the most recent version as of 2014-3-28, here).

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