The software world is full of PDF utilities from the four corners of the globe. PSW-soft's Guaranteed PDF Decrypter (GuaPDF) is an example; its developers' page is called Russian Password Crackers, which sounds like something out of the Cold War but in fact is a group specializing in cryptosecurity. GuaPDF is designed to remove various restrictions from PDF files, up to 256-bit key encryption, and to decrypt 40-bit key passwords of any length in any language. It can also harness the processing power of Nvidia CUDA-capable graphics cards to accelerate decryption.
GuaPDF downloads as a ZIP file but opens … Read more