to_s (PDF::Writer::Object::Encryption)

        # File lib/pdf/writer/object/encryption.rb, line 44
    44:   def to_s
    45:     res = "\n#{@oid} 0 obj\n<<\n/Filter /Standard\n"
    46:     res << "/V 1\n/R 2\n"
    47:     res << "/O (#{PDF::Writer.escape(@owner_info)})\n"
    48:     res << "/U (#{PDF::Writer.escape(@user_info)})\n"
    49:     res << "/P #{(((@perms ^ 255) + 1) * -1)}\n"
    50:     res << ">>\nendobj\n"
    51:     res
    52:   end