TdxPDFEncryptionAlgorithmType Enum

Enumerates types of algorithms used to encrypt PDF documents.

Declaration

TdxPDFEncryptionAlgorithmType = (
    eatRC40Bit,
    eatRC128Bit,
    eatAES
);

Members

Name	Description
eatRC40Bit	The Rivest Cipher 4 (RC4) algorithm with a 40-bit key. Limits the number of functional user access flags.
eatRC128Bit	The Rivest Cipher 4 (RC4) algorithm with a 128-bit key. This is a recommended option.
eatAES	The Advanced Encryption Standard (AES) algorithm. Not available for document save operations.

Remarks

Options include:

Value	Description
eatRC40Bit	The Rivest Cipher 4 (RC4) algorithm with a 40-bit key. This encryption algorithm reduces the number of functional user access permission flags: The pdpAllowPrintHighResolution flag maps to dpdAllowPrint. The pdpAllowExtractContent flag maps to AllowCopyContent. The pdpAllowFillFields flag maps to pdpAllowAddOrModifyTextAnnotations. The pdpAllowAssembleDocument flag maps to pdpAllowEditContent.
eatRC128Bit (default)	The Rivest Cipher 4 (RC4) algorithm with a 128-bit key. This is the recommended option for PDF document encryption.
eatAES	The Advanced Encryption Standard (AES) algorithm. The current implementation of the PDF document container can load documents encrypted with this algorithm but cannot use AES to encrypt saved documents. A PDF document’s SaveToFile or SaveToStream procedure call raises an exception if encryption is enabled and the eatAES algorithm is selected.

A PDF document’s SecurityOptions.Algorithm property references the TdxPDFEncryptionAlgorithmType type.