I get lots of e-bills (utility, telephone, the 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 do not 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?