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EncryptFile

Security and Signatures

Description

Encrypts a file on disk and saves the results to a new file. The entire document does not have to be loaded into memory so this function can be used to encrypt huge documents.

Syntax

Delphi

function TDebenuPDFLibrary1511.EncryptFile(InputFileName, OutputFileName, Owner, 
  User: WideString; Strength, Permissions: Integer): Integer;

ActiveX

Function DebenuPDFLibrary1511.PDFLibrary::EncryptFile(InputFileName As String,
  OutputFileName As String, Owner As String, User As String,
  Strength As Long, Permissions As Long) As Long

DLL

int DPLEncryptFile(int InstanceID, wchar_t * InputFileName,
  wchar_t * OutputFileName, wchar_t * Owner, wchar_t * User, int Strength,
  int Permissions)

Parameters

InputFileName The name of the file to encrypt.
OutputFileName The name of the destination file to create.
Owner The owner password to use for the encrypted file. This is sometimes called the "master" password or the "permissions" password. This password will be needed to change the document.
User The user password to use for the encrypted file. This is sometimes called the "open" password, it will allow the user to open the document but not to use the document in ways not permitted.
Strength The strength of encryption to use:
0 = 40-bit RC4 encryption
1 = 128-bit RC4 encryption
2 = 128-bit AES encryption (requires Acrobat 7 or later)
3 = 256-bit AES encryption (requires Acrobat 9 or later)
4 = 256-bit AES encryption (requires Acorbat X or later)
Permissions A value created with the EncodePermissions function

Return values

0 The file could not be encrypted. Check the result of the LastErrorCode function to determine the cause of the failure.
1 The document was encrypted successfully

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