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APPENDIX H                                   Compatibility and Implementation Notes



143. In Adobe Reader 6.0, any usage right that permits the document to be
     modified implicitly enables the FullSave right.
      Adobe Reader 7.0 and 8.0 mimic Reader 6.0 behavior if the PDF docu-
      ment contains a UR dictionary but omits a UR3 dictionary. If the PDF doc-
      ument contains a UR3 dictionary, only rights specified by the Annots entry
      that permit the document to be modified implicitly enable the FullSave
      right. For all other rights, FullSave must be explicitly enabled in order to
      save the document. (Signature rights permit saving as part of the signing
      process but not otherwise).
      If the P entry in the UR transform parameters dictionary is true, Acrobat
      7.0 and greater viewer applications permit only those rights that are en-
      abled by the entries in the dictionary. However, viewers permit saving the
      document as long as any rights that permit modifying the document are
      enabled.
144. In Acrobat 6.0 and greater, the DigestMethod entry in the signature refer-
     ence dictionary is required, even though this specification indicates that
     entry is optional.
145. In Acrobat 6.0 and greater, the V entry in the various transform parame-
     ters dictionaries are required, even though this specification indicates oth-
     erwise. Those dictionaries include the DocMDP transform parameters
     dictionary, the UR transform parameters dictionary, and the FieldMDP
     transform parameters dictionary.


8.7.2, “Signature Interoperability”
146. In versions earlier than Acrobat 6.0, it was a requirement that the signer’s
     signature be the first certificate in the PKCS#7 object. Acrobat 6.0 re-
     moved this restriction, but for maximum compatibility with earlier ver-
     sions, this practice should be followed.

8.9, “Document Requirements”
147. PDF 1.7 added the ability to specify requirements the PDF consumer ap-
     plication must satisfy before it can process or display a PDF document.
     Although Acrobat 7.0 officially supports PDF 1.6, Acrobat 7.0.5 also sup-
     ports this document requirements feature.

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