2 Replies Latest reply on Jun 3, 2015 11:00 AM by IsakTen

    Acrobat Reader X invalidate the signature if the original document (before signature) contains a not used object

    gauthierm48979412

      Hi,

       

      I would like to understand a comportment of Acrobat Reader X. I didin’t find something in the “ISO-32000-1” that can explain this.

      The context: I sign a document with a DocMDP signature and with an incremental update (The signature process is not realized with Acrobat Reader).

      ____


      Acrobat Reader X invalidate the signature if the original document (before signature) contains a not used object.

      Example with the file “object_5_not_used.pdf”: the object “5” is not used and not marked as free.


      the object “5” is not used and not marked as free

      0 5

      0000000000 65535 f

      0000000259 00000 n

      0000000313 00000 n

      0000000017 00000 n

      0000000065 00000 n

      6 1

      0000000208 00000 n

      _________

       

      Acrobat Reader X accepts the signature if the original document contains a not used object but marked as free.

      Example with the file “object_5_free.pdf”: the object “5” is not used but is marked as free.

      Header 1

      0 7

      0000000000 65535 f

      0000000259 00000 n

      0000000313 00000 n

      0000000017 00000 n

      0000000065 00000 n

      0000000000 65535 f

      0000000208 00000 n

      ________

       

       

      For information, Acrobat Reader XI accepts the signature of the two documents.

      Is this a bug in Acrobat Reader X?


      Thanks.