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See more: C# .NET Encryption
hey
i have awebsite my friend develops it in php this site offer pdf books
user purchase book and download it   but encrypted
i want to develop a c# windows app to   decrypt this pdf and open in my app and   user can add notes on file but encryption and decryption pdf files i dono't know
anybody can help me
Posted 27-Feb-12 2:33am
Comments
ryanb31 at 27-Feb-12 8:41am
   
Refer to the PDF SDK.
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Solution 2

Install Spire.PDF for .NET; then use the below sample C# code to encrypt any PDF files:

  static void EncryptPDF()
   {
   //Create a pdf document.
   PdfDocument doc = new PdfDocument();
   // Create one page
   PdfPageBase page = doc.Pages.Add();
   //Draw the page
   DrawPage(page);
 
   //encrypt
   doc.Security.KeySize = PdfEncryptionKeySize.Key128Bit;
   doc.Security.OwnerPassword = "e-iceblue";
   doc.Security.UserPassword = "test";
   doc.Security.Permissions = PdfPermissionsFlags.Print | PdfPermissionsFlags.FillFields;
 
   doc.SaveToFile("Encryption.pdf");
   doc.Close();
 
   //Launching the Pdf file.
    System.Diagnostics.Process.Start("Encryption.pdf");
}
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Solution 3

<b>PDFs books   downloaded from PHP site
these books downloaded with encryption or password
i want to develop c# app to be the only program can open these books
and other PDF tools cannot do this
how?</b>
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Solution 4

我也在找解密 根本就没有 大多数都是收费的
I AM FIND
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