Adobe Acrobat SDK
Interactive Features (Chapter 8 in PDF Reference)
Adobe® Supplement to the ISO 32000
8.6.3 Field Types 43
8.6.3 Field Types
Signature Fields
Add the new
P
entry to Table 8.82 on page 697 of the
PDF Reference
.
TABLE 8.82 Entries in a signature field lock dictionary
KEY
TYPE
DESCRIPTION
P
number
(
Optional; ExtensionLevel 3
) The access permissions granted for
this document. Valid values follow:
1
, no changes to the document are permitted; any change to
the document invalidates the signature.
2
, permitted changes are filling in forms, instantiating page
templates, and signing; other changes invalidate the
signature.
3
, permitted changes are the same as for
2
, as well as
annotation creation, deletion, and modification; other
changes invalidate the signature.
Default value: none; absence of this key results in no effect on
signature validation rules.
If MDP permission is already in effect from an earlier
incremental save section or the original part of the document,
the number shall specify permissions less than or equal to the
permissions already in effect based on signatures earlier in the
document. That is, permissions can be denied but not added. If
the number specifies greater permissions than an MDP value
already in effect, the new number is ignored.
If the document does not have an author signature, the initial
permissions in effect are those based on the number
3
.
The new permission applies to any incremental changes to the
document following the signature of which this key is part.
See implementation note E-14 on
page 131
.
