Hi All,
I have one encrypted with master password pdf file (cannot edit, print, make remarks ...). I need to decrypt this file, but before that I would like to have some theory obout encryption in PDF files.
I need to know what is the difference between encrypted and not encrypted file i.e. is this an hackers detail, or serious encryption wich cannot be just removed.
Here is my simple theory: If i can view the file, then I can print it. The only problem is some check inside the program. I did some experiments, and made some print out. Can anybody tell me, will it be the same about text extracting, and editing ?

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10x in advice, and sorry for my bad english.

Did you search on Google first? It seems that there are two types of restrictions on PDFs: "user password" which prevents the file from being opened, and "owner password" which prevents editing, printing, etc. It seems that the latter (what you need) is easy to remove and there are dozens of programs by searching for "PDF decryption" or something.