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     APPENDIX I                                              Computation of Object Digests



I.2.1 Document

     When calculating a digest for the document, the following items are included, in
     order:

     • The values of the following entries in the document catalog (see Table 3.25), if
       present: AA, Legal; and Perms
     • The values of the following entries in the document information dictionary
       (see Table 10.2), if present: Title, Author, Keywords, and Subject
     • All page objects in the document, in page order, as described in Section I.2.2,
       “Page Objects”
     • All named pages specified in the Pages name tree, sorted by name, as described
       in Section I.2.3, “Named Pages”
     • All embedded files specified in the EmbeddedFiles name tree, sorted by name,
       as described in Section I.2.4, “Embedded Files”


I.2.2 Page Objects

     For page objects (see Table 3.27), the digest includes the values of the following
     entries, in order, if present. For entries listed as inheritable, their values may be
     inherited from ancestor nodes in the page tree if not specified explicitly.

     • MediaBox (inheritable)
     • CropBox (inheritable)
     • Resources (inheritable)
     • Contents
     • Rotate (inheritable)
     • AA
     • Annots. This entry consists of an array of dictionaries for annotations on the
       page. They are sorted by the value of the NM entry; if NM is not present, a glo-
       bally unique ID (GUID) is supplied as NM.
       For each annotation, if it is a widget, the values added to the digest are those
       specified in Section I.2.6, “Form Fields.” If it is any other type of annotation, the
       values added to the digest are those specified in Section I.2.5, “Annotation Dic-
       tionaries.” However, when the transform parameters specify that annotations

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