The password-based standard security handler of the PDF specification, identified by a /Filter value of /Standard.
The PDF specification defines one security handler that should be implemented by all conforming PDF libraries and applications. This standard security handler allows access permissions and a user password as well as an owner password to be set.
StandardSecurityHandler::EncryptionOptions for all valid options that can be used with this security handler when encrypting a document. And see prepare_decryption for all allowed options when decrypting a document.
The access permissions (see
StandardSecurityHandler::Permissions) can be used to restrict what a user is allowed to do with a PDF file.
When a user or owner password is specified, a PDF file can only be opened when the correct password is supplied. To open such an encrypted PDF file, the
decryption_opts provided to
HexaPDF::Document.new needs to contain a :password key with the password.
See: PDF2.0 s7.6.4
The padding used for passwords with fewer than 32 bytes. Only used for revisions <= 4.
See: PDF2.0 s18.104.22.168
Public Instance Methods
Additionally checks that the document trailer's ID has not changed.