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Code Samples - Neevia PDFsign/encrypt

Example 1: Encrypt a PDF file - C# Copy 

Add a reference in your Visual Studio project to PDFsignNET assembly.
To do this:
        a. On the Project menu, click Add Reference;
        b. On the .NET tab, locate PDFsignNET and then click Select;
        c. Click OK in the Add References dialog box to accept your selections. 
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  PDFsign.Neevia NVsign = new PDFsign.Neevia();
  int retVal;

  NVsign.PDFEncrypt = true;
  NVsign.PDFEncryptionType = "rc4";
  NVsign.PDFOwnerPassword = "owner";

  // p - document printing is denied
  // e - disable extraction of text and graphics
  NVsign.PDFPermissions = "pe";

  retVal = NVsign.EncryptPDF(@"c:\in.pdf",@"c:\out.pdf");

  if (retVal != 0) {
     MessageBox.Show("Error code = " + retVal.ToString());
  } else {
     MessageBox.Show("Done");
  }