PdfDocumentSecurityLevel EnumerationTerminal Works - PDF Printing.Net Library
Specifies the security level of the PDF document.

Namespace: PdfEdit.Pdf.Security
Assembly: PdfPrintingNet (in PdfPrintingNet.dll) Version: 5.2.1.0 (5.2.1.0)
Syntax

public enum PdfDocumentSecurityLevel
Members

  Member nameValueDescription
None0 Document is not protected.
RC4_401 Encrypted with RC4 using old weak algorithm based on 40 bit key. Not recommended. pdf_refeence_1-7.pdf: "Algorithm 3.1 on page 119, with an encryption key length of 40 bits; see below." Version: 1, Revision: 2
RC4_Custom2 (PDF 1.4) Document is protected with RC4 algorithm and custom length encryption key between 40 and 128 bits. Version: 2, Revision: 3
RC4_1283 Document is protected with RC4 and 128-bit encryption key. This version uses crypt filters that may allow you to specify if metadata will get encrypted or not. Version: 4, Revision: 4
AES_1284 Document is protected with AES and 128-bit encryption key. Thus version uses crypt filters that may allow you to specify if metadata will get encrypted or not. Version: 4, Revision: 4
AES_256_Weak5 Document is protected with AES weak/unsecure algorithm and 256-bit encryption key. Not recommended. This version uses crypt filters that may allow you to specify if metadata will get encrypted or not. INFO: This algorithm will be marked as deprecated in PDF 2.0 because of security issues. Version: 5, Revision: 5
AES_2566 Document is protected with AES and 256-bit encryption key. This version uses crypt filters that may allow you to specify if metadata will get encrypted or not. Version: 5, Revision: 6
See Also

Reference