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HowTo: Linux Remove a PDF File Password Using Command Line Options

I get lots of e-bills (utility, telephone, Internet, mobile, cable and so on) in a PDF format for my small business and I need to forward those to my accountant. However, all PDFs files are password protected. I don't want to share my account password with anyone to just open my bills. Evince is a PDF document viewer capable of displaying password protected files but it cannot remove the password. How do I remove a password from all PDFs under Ubuntu or any other Linux distribution in a batch mode?
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Bash Shell Loop Over Set of Files

How do I run shell loop over set of files stored in a current directory or specified directory?
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