Golang encryption wrapper around qpdf/pdftk - change password of pdf.
I could not remember the command line args, and I wanted to create a small golang application.
The result is a golang testbed and really simple cmd to use a PDF and change the password of the given PDF to a different one. So basically the whole logic of the cmd is to call the PDF utilities qpdf/pdftk with the command line args:
qpdf --password=YOURPASSWORD-HERE --decrypt input.pdf output.pdf
qpdf --encrypt <password> <password> 128 -- doc_without_pass.pdf doc_with_pass.pdf
pdftk document.pdf input_pw <password> output insecure.pdf
pdftk insecure.pdf output secure.pdf user_pw <password>