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Interactive Features (Chapter 8 in PDF Reference)
This section describes extensions to the PDF specification contained in the PDF Reference, sixth edition,
version 1.7 and in ISO 32000 (Document management - Portable document format - PDF 1.7). The latter
document is the version of the PDF specification that has been ratified by the ISO. These documents differ
as described in About the ISO Draft of the PDF 1.7 Reference.
Note:
This guide uses italics to identify information not intended for inclusion in the PDF specification. For
convenience, the phrase BaseVersion 1.7, Adobe ExtensionLevel 3 is shortened to ExtensionLevel 3
throughout this document.
8.2 Document-Level Navigation
8.1 Viewer Preferences
Add the new
KEY
Enforce
After Table 8.1, and before Section 8.2, add the following paragraph and table.
Table 8.1a shows the only valid name that can appear in an
should be limited to keys in the viewer preferences dictionary with the following qualities:
Can be assigned values (default or specified) that cannot be used in a denial-of-service attack
●
Have default values that cannot be overridden using the application user interface
●
NAME
PrintScaling
8.2.4 Collections
Following the paragraph (in the PDF Reference) that begins with "The file attachments comprising a collection,"
insert the two paragraphs below.
entry in Table 8.1.
Enforce
Table 8.1 Entries in a viewer preferences dictionary
TYPE
array of names (Optional; ExtensionLevel 3) Viewer preference settings that may be
Table 8.1a Names defined for an Enforce array
DETAILS
(Optional; ExtensionLevel 3) This name may appear in the
corresponding entry in the viewer preferences dictionary (Table 8.1) specifies a valid
value other than
VALUE
enforced by conforming readers and that will not be overridden by
subsequent selections in the application user interface.
Names defined for an Enforce array
Enforce
.
AppDefault
specifies valid names.
array. Future additions to this table
array only if the
Enforce
Table 8.1a
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