DLI Implementation and Reference Guide - Datalogics

Beginning and Ending a Document 3.5
to the user password, a character pointer to the owner password, and a PDPerms
data type. The latter must contain the security permissions as outlined in the Acrobat
Core API Reference Manual in the PDPerms definition. This call may be made at any
time prior to dlpdfdocwritepdf.
dlpdfdocsetencryptkeylen
This enables variable length encryption keys as supported by the Adobe PDF Library.
It accepts a DLPDFDOC pointer, a parameter specifying the number of bytes between 5
and 16 inclusive used to determine key length used during encryption.
This function can be called to set the length of the encryption key before a call to
dlpdfdocencrypt if the application is to use an encryption key length other than
the original 40-bit length provided in previous versions.
The use of this function is optional if the original 40-bit key length is to be used.
Subsequent calls to dlpdfdocencrypt will use the number of bytes specified in the
call to dlpdfdocsetencryptkeylen. If the key length has not been set previously,
the standard 5-byte value is used as the default.
For more information on Encryption, refer to the beginning of section 3.5,
"Encryption," in the Adobe PDF Reference (Fourth edition). For information on
PDDocSetNewSecurityData and StdSecurityDataRec, see the Adobe Core
API Reference Guide (March, 2004 edition), pages 1352 and 2988 respectively.
NOTE: For applications generating multiple documents,
dlpdfdocsetencryptkeylen must be called for each document for which
an encryption key length other than the standard 5-byte value is desired.