SQL Server Requires Chilkat v11.7.0+

Password-Protect a PDF with AES-256 Encryption

See more PDF Protection Examples

Demonstrates the simplest way to encrypt a PDF so that it needs a password to open. The passwords come from the UserPassword and OwnerPassword properties, and Protection with the encrypt operation and an empty JSON uses the defaults: AES-256, everything encrypted, every permission granted. Protection only records the security the PDF will be saved with. Nothing is encrypted until WriteFile is called. SQL Server

--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    --  This example requires the Chilkat API to have been previously unlocked.
    --  See Global Unlock Sample for sample code.

    --  The PDF used in this example is available at two_page_memo.pdf

    DECLARE @pdf int
    EXEC @hr = sp_OACreate 'Chilkat.Pdf', @pdf OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OAMethod @pdf, 'LoadFile', @success OUT, 'qa_data/pdf/two_page_memo.pdf'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @pdf, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @pdf
        RETURN
      END

    --  The passwords are taken from these two properties at the time Protection is called.
    --  The user password opens the PDF.  The owner password opens it too, and is the one needed
    --  later to change or remove the protection.
    EXEC sp_OASetProperty @pdf, 'UserPassword', 'user-secret'
    EXEC sp_OASetProperty @pdf, 'OwnerPassword', 'owner-secret'

    --  An empty JSON asks for the defaults: AES-256, everything encrypted, every permission granted.
    DECLARE @json int
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @json OUT

    DECLARE @jsonOut int
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @jsonOut OUT

    EXEC sp_OAMethod @pdf, 'Protection', @success OUT, 'encrypt', @json, @jsonOut
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @pdf, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @pdf
        EXEC @hr = sp_OADestroy @json
        EXEC @hr = sp_OADestroy @jsonOut
        RETURN
      END

    --  Nothing has been encrypted yet.  "pending" describes the security the PDF will be saved with.

    EXEC sp_OAMethod @jsonOut, 'StringOf', @sTmp0 OUT, 'pending.algorithm'
    PRINT 'algorithm: ' + @sTmp0

    EXEC sp_OAMethod @jsonOut, 'StringOf', @sTmp0 OUT, 'pending.pdfVersion'
    PRINT 'PDF version: ' + @sTmp0

    EXEC sp_OAMethod @jsonOut, 'BoolOf', @iTmp0 OUT, 'pending.userPasswordRequired'
    PRINT 'password needed to open: ' + @iTmp0

    --  Writing the file applies it.
    EXEC sp_OAMethod @pdf, 'WriteFile', @success OUT, 'qa_output/memo_encrypted.pdf'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @pdf, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @pdf
        EXEC @hr = sp_OADestroy @json
        EXEC @hr = sp_OADestroy @jsonOut
        RETURN
      END

    --  PreLoadCheck reports a file's encryption without loading it, and needs no password.
    DECLARE @checker int
    EXEC @hr = sp_OACreate 'Chilkat.Pdf', @checker OUT

    DECLARE @info int
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @info OUT

    EXEC sp_OAMethod @checker, 'PreLoadCheck', @success OUT, 'qa_output/memo_encrypted.pdf', @info
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @checker, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @pdf
        EXEC @hr = sp_OADestroy @json
        EXEC @hr = sp_OADestroy @jsonOut
        EXEC @hr = sp_OADestroy @checker
        EXEC @hr = sp_OADestroy @info
        RETURN
      END

    EXEC sp_OAMethod @info, 'BoolOf', @iTmp0 OUT, 'encrypted'
    PRINT 'encrypted: ' + @iTmp0

    EXEC sp_OAMethod @info, 'BoolOf', @iTmp0 OUT, 'openPasswordRequired'
    PRINT 'openPasswordRequired: ' + @iTmp0

    --  With the password, the PDF opens normally.
    DECLARE @reader int
    EXEC @hr = sp_OACreate 'Chilkat.Pdf', @reader OUT

    EXEC sp_OASetProperty @reader, 'UserPassword', 'user-secret'
    EXEC sp_OAMethod @reader, 'LoadFile', @success OUT, 'qa_output/memo_encrypted.pdf'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @reader, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @pdf
        EXEC @hr = sp_OADestroy @json
        EXEC @hr = sp_OADestroy @jsonOut
        EXEC @hr = sp_OADestroy @checker
        EXEC @hr = sp_OADestroy @info
        EXEC @hr = sp_OADestroy @reader
        RETURN
      END

    EXEC sp_OAGetProperty @reader, 'NumPages', @iTmp0 OUT
    PRINT 'pages: ' + @iTmp0

    --  Sample output:

    --  algorithm: aes-256
    --  PDF version: 1.7
    --  password needed to open: True
    --  encrypted: True
    --  openPasswordRequired: True
    --  pages: 2

    EXEC @hr = sp_OADestroy @pdf
    EXEC @hr = sp_OADestroy @json
    EXEC @hr = sp_OADestroy @jsonOut
    EXEC @hr = sp_OADestroy @checker
    EXEC @hr = sp_OADestroy @info
    EXEC @hr = sp_OADestroy @reader


END
GO