Re: [pdf-devel] Encryption filters

[jemarch]

Hi Leonard.

   Just remember that normal PDF encryption does NOT use "Crypt
   Filters", but instead simply encrypts all strings and streams.
   "Crypt Filters" are only ever used as Identity, in the case of
   unencrypted metadata, or on embedded files (for a secure envelope).

Thanks for the note.

As I understand it we need to implement the crypt filters anyway,
since the standard allow to encrypt individual streams and embedded
files are contained in streams.