PDF Document Encryption Algorithms

Publisher uses an encryption algorithm based on the PDF document security setting.

Security Level	Encryption Scheme	PDF Version	Acrobat Version
Low	RC4 (40bit)	1.1	3.0
Medium	RC4 (128bit)	1.4	5.0
High	AES (128bit)	1.5	7.0
Highest	AES (256bit)	1.7 (extension level 5)	X