Rank: Newbie
Groups: Member
Joined: 8/27/2013
Posts: 5
|
Hi! I want to merge some secured PDF files, where editing is not permitted. However I already get exceptions when trying to initialize the PdfDocument instances.
Code:
System.Exception: Catalog object not found.
at EO.Pdf.PdfDocument..ctor(hh A_0)
at EO.Pdf.PdfDocument..ctor(String fileName)
System.NullReferenceException: Object reference not set to an instance of an object.
at EO.Pdf.Internal.dt.a(hh A_0)
at EO.Pdf.Internal.hh.a(g3 A_0)
at EO.Pdf.Internal.hh.a(Stream A_0, Boolean A_1)
at EO.Pdf.Internal.hh.a(String A_0)
at EO.Pdf.Internal.hh..ctor(String A_0, PdfDocumentSecurity A_1)
at EO.Pdf.PdfDocument..ctor(String fileName)
Even if I supply the correct password for editing through an PdfDocumentSecurity instance, I get the same exceptions. Here are some test files (password is "1234"): https://dl.dropboxusercontent.com/u/9917425/secured.pdfhttps://dl.dropboxusercontent.com/u/9917425/secured2.pdfWhat am I doing wrong? With other libraries like Aspose.Pdf, merging such files is possible without supplying a password. Best Regards, Oliver Hanappi
|
Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,195
|
Hi,
We do not support these files yet. PDF supports multiple encryption methods. We only support the standard RC4 encryption/decryption algorithm. Your file uses AES. So we are not able to open it yet.
I believe theoretically it is possible to merge encrypt files without providing a password if both files have the same password and the same "security seed". However in reality this is rare. So in order to merge them properly, we always decode everything first, which requires the correct password.
Thanks!
|