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  • How to remove restrictions for a secured PDF..? C#

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    Hi guys, How to allow copy content option for a secured PDF. Currently am using Spire.PDF library, it is giving result as I except, it is a free version supports only for below 10 page PDFs, but my pdfs have more than 200 pages. Any other solutions?, also worked with PdfSharp library, it is not supporting Adobe 6 featured pdfs. Googled many times, but still am not getting solutions for this..

    here is code for Spire.PDF

    string input = @"C:\xxxx\2006-Catalog.pdf";
    string output = @"C:\xxxx\Unlocked-2006-Catalog.pdf ";
    PdfDocument doc = new PdfDocument();
    doc.LoadFromFile(input);
    doc.Security.ResetPermissions(Spire.Pdf.Security.PdfPermissionsFlags.AccessibilityCopyContent);
    doc.SaveToFile(output);
    Console.WriteLine("Done");
    

 2 Answer(s)

  • Hi,

    The password of secured PDF is mandatory to copy its content. You can open PDF file by this method: Spire.Pdf.PdfDocument(string filename, string password) Then, modify passwords by resetting owner password and user password as empty. Below shows the whole code of modifying passwords of secured PDF file,

     //load a encrypted file and decrypt it
     string input = @"C:\xxxx\2006-Catalog.pdf";
     string output = @"C:\xxxx\Unlocked-2006-Catalog.pdf ";
     PdfDocument doc = new PdfDocument(input, "password");
    
     //reset PDF passwords and set user password permission
     doc.Security.OwnerPassword = "";
     doc.Security.UserPassword = "";
     doc.Security.Permissions = PdfPermissionsFlags.Print | PdfPermissionsFlags.FillFields;
    
     //Save pdf file.
     doc.SaveToFile(output);
     doc.Close();
    

    if you find the answer helpful please mark it correct, so that, other developmentnt community can take advantage.

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