SECTION 3.5
135
Encryption
KEY
TYPE
VALUE
EncryptMetadata
boolean
(Optional; used only by crypt filters that are referenced from
StmF
in an encryp-
tion dictionary)
Indicates whether the document-level metadata stream (see
Section 10.2.2, “Metadata Streams”) is to be encrypted. PDF consumer appli-
cations should respect this value when determining whether metadata should
be encrypted; see implementation note 32 in Appendix H.
Default value:
true
.
Example 3.12 shows the use of crypt filters in an encrypted document containing
a plaintext document-level metadata stream. The metadata stream is left as is by
applying the
Identity
crypt filter. The remaining streams and strings are
decrypted using the default filters.
Example 3.12
%PDF1.5
1 0 obj
% Document catalog
<< /Type /Catalog
/Pages 2 0 R
/Metadata 6 0 R
>>
endobj
2 0 obj
% Page tree
<< /Type /Pages
/Kids [3 0 R]
/Count 1
>>
endobj
3 0 obj
% 1s t page
<< /Type /Page
/Parent 2 0 R
/MediaBox [0 0 612 792]
/Contents 4 0 R
>>
endobj
4 0 obj
% Page contents
<< /Length 35 >>
stream
*** Encrypted Page-marking operators ***
endstream
endobj
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