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grab Advance PDF Password Recovery from the link..but the trial version only limits 1-2 pages of decrypting..basically the software creates another pdf from the original file but with all the security features disable..to modify pdf files, try pdf acrobat maker..
To change Password protected PDF files and to take off all the restriction so that the PDF file can easily be copied, edited, printed etc. For this PDF Password recovery Tool is efficient recovery tool that removes all the restriction from any User (this type of password restriction protects the PDF files from opening) and Owner (password that restricts the PDF files from copying, editing, or printing etc.)Passwords with by trying all the possible passwords until the documents get opened with help of its efficient decryption techniques such as Brute-force, dictionary attack, mask attack etc. and allow you to define a new password to the file. See more :