[Solved] Decrypting PDF throws an exception error in Creator

[wd818]

Hello

I get an exception error when decrypting a password protected PDF file using PDF Creator 3.03. It is thrown by the function Encrypt()

The error message is

System.Runtime.InteropServices.SEHEException: External component has thrown an exception.
At CWnd.InvokeHelper(CWnd*, Int32, UInt16, UInt16, Void*, Byte *)
At CPdfcreactivex.Encrypt()

Here is what I do to decrypt the PDF file and save it

m_pdf is an ActiveX in my MFC application

m_pdf.Open(strURL, “123”); //Open password protected PDF with its password 123

try
{
m_pdf.Encrypt("", "", 0); //decrypt file
}
catch (System::Exception ^ e)
{
::AfxMessageBox(CString(e->ToString())); //display exception message
}

m_pdf.Save(newLocation, 1); //save to newLocation

Can someone help me?

Thanks

[David]

Hello

Your code for decrypting the file is correct.

You need to check that you are using the Owner Password to open the file.
If you open the document using the User Password and the option "Changing the document" is not enabled, you will encounter the problem you mentioned.

Hope that helps?

David

[wd818]

After doing the following, I still get the same exception error with a USER's password

m_pdf.Open(strURL, “123”); //Open password protected PDF with its USER's password 123

try
{
m_pdf.Encrypt("", "", 0xFFFFFFC0 + 8 ); //decrypt file, "Changing the document" is enabled?
}
catch (System::Exception ^ e)
{
::AfxMessageBox(CString(e->ToString())); //display exception message
}

m_pdf.Save(newLocation, 1); //save to newLocation

I have tried with an owner's password, it decrypts with no problem.
How to correctly enable the option "Changing the document" when the only password available is a USER's password?

[Joan]

A User's password doesn't decrypt the PDF file. This is unethical Only owners have the right to decrypt a document

[wd818]

I see, thank you for your help.