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Example 12: Encrypt an existing PDF file (40 bits) from C#  Print Example 

Add a reference in your project to docCreator library.
To do this:
      a. On the Project menu, click Add Reference.
      b. On the COM tab, locate docCreator Library and then click Select.
      c. Click OK in the Add References dialog box to accept your selections.
   Neevia.docCreator DC = new Neevia.docCreator();

   DC.setParameter("PDFEncryption", "true");
   DC.setParameter("PDFEncryptionType", "40");

   DC.setParameter("PDFOwnerPassword", "test");
   DC.setParameter("PDFUserPassword", "open");

   DC.setParameter("PDFNoCopyPermission", "true");
   DC.setParameter("PDFNoPrintPermission", "true");
   DC.setParameter("PDFNoChangePermission", "true");
   DC.setParameter("PDFNoAddPermission", "true");

   int RVal = DC.encryptPDF(@"d:\test.pdf", @"d:\out.pdf");
   DC = null;

   if (RVal != 0) {
      MessageBox.Show("There was an error encrypting the document!!!");
   } else {
      MessageBox.Show("Done encrypting !!!");

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