azosztigen!
<</CF<</StdCF<</AuthEvent/DocOpen/CFM/V2/Length 16>>>>/Filter/Standard/Length 128//V 4>>
crypt filters named StdCF whose dictionaries contain a CFM value of V2 or AESV2 and an AuthEvent value of DocOpen.
V2 The application asks the security handler for the encryption key and implicitly decrypts data with Algorithm 3.1, using the RC4 al- gorithm.
ez alapjan 128 bites RC4, nem tunik veszesnek annyira megtorni...