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How Can I Remove Password Protection From A PDF?
Probably not without heavy cracking. You would have to reverse engineer the method used for security when those files are stored in a secure fashions. You are likely going to need to find an exploit in the source code, or figure out which algorithms are used to encrypt the password. Then you would have to actually crack the passcode, which could vary in difficulty depending on which encryption protocols are used. I don't know if any current exploits to do any of the above. With that said, I would not be surprised if some exist. Maybe you can do a little searching around and researching the subject. Unfortunately, that's the only advice that I have to share at this time.
Password Protect PDF: All You Need to Know
If you want a full review for the subject, please get in touch with me — I'm available to discuss anything I might know.