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PDFEncryptionAlgorithmEnum enumeration constants are used to specify the encryption algorithm for exported PDF files. 
typedef enum {
  PDFEA_RC4
  PDFEA_AES128
  PDFEA_AES256
} PDFEncryptionAlgorithmEnum;

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Elements

NameDescription
PDFEA\_RC4RC4 encryption supported for PDF version 1.3 (40-bit key only) and PDF version 1.4 or above (longer keys up to 128 bit). Key length is set using the PDFEncryptionInfo::KeyLength property.
PDFEA\_AES128128-bit AES encryption supported for PDF version 1.6 and above.
PDFEA\_AES256256-bit AES encryption supported for PDF version 1.7 and above.

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Used in

PDFEncryptionInfo::EncryptionAlgorithm