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In this article, we show how to decrypt a PDF file in Python. Decrypting means that we are able to undo the encryption of a PDF file so that we can read it. Learn how to add and remove passwords to PDF files using PyPDF4 library, as well as using pyAesCrypt to encrypt and decrypt PDF files in Python. Decrypt password-protected PDF in Python. GitHub Gist: instantly share code, notes, and snippets.Decrypt & read a PDF document in Python. To read a PDF document with password protection. Python. doc = PDFDoc(filename) # At this point MySecurityHandler We'll be using the PyPDF2 module to encrypt and decrypt our PDF files. PyPDF2 is an external library and needs to be installed using the command: