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How Do I Use evince To Remove The Password?

Open a pdf file using evince itself, enter:

evince input.pdf

Enter your password. Once opened click on File > Print > Select "Print to file" > Select "PDF" as output format and click on Print.
Writing a shell script left as an exercise to the readers.

REFERENCES
http://www.cyberciti.biz/faq/removing-password-from-pdf-on-linux/