|12-21-2009, 02:21 PM||#1|
Join Date: Aug 2008
Confused by behavior of two pdfs w/permissions passwords, but no open passwords/DRM
1.I have two pdf files w/the following behavior, which I'll call file A and file B.
-These files can be opened on any computer w/any user w/o needing a password (so there is no certificate security or adobe content server type security).
-Since I can open the files w/o a password, that means there is no (Open Password), and they do have (Permissions Passwords) since I can’t modify the documents. Also, looking at properties within adobe shows me that the security method is “password security” and can be opened by adobe 6 or later.
-there does not appear to be any 3rd party encryption.
-file A and file B can be opened and read in adobe acrobat 8 and adobe reader 9. However, when using Foxit 3 to open them, file A looks normal, but file B looks completely blank
2.When I use standard password removal software (eg, PDF password cracker, not using brute-force) on file A, the software claims that password removal is successful.The resulting file can now be modified, and is still readable in Acrobat, Reader, and Foxit.
-When I use standard password removal software on file B, the software claims that password removal is successful. HOWEVER, while the resulting file can now be modified, it is useless – every page is blank, whether I use adobe or foxit to open and read it
3.Per instructions in this thread: https://www.mobileread.com/forums/showthread.php?t=37974 ,
Both files appear to have Standard - Password Security
712 0 obj<</R 3/Length 80/Filter/Standard/O(+†ÊV~z¿`ÑÔ; Ã*Ÿ> A 8@¹©Þ<fg\(RÎÙ®)/P -64/U(ÈË\(À¹î[¨ˆ\n\r %•v’
279 0 obj <</Length 80/CF<</StdCF<</Length 10/AuthEvent/DocOpen/CFM/V2>>>>/Filter/Standard/O(+†ÊV~z¿`ÑÔ; Ã*Ÿ> A 8@¹©Þ<fg\(RÎÙ®)/P -64/R 4/U(mž×Ã\\éH«†Ó%žÿ-NÙ
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