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Example 4: Encrypt a PDF file (VC#)  

Note: Add a reference in your project to PDFsignNET
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.
  Neevia.PDFsign NVsign = new Neevia.PDFsign();
  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");
  }


I was looking for a product that could place watermarks on very large PDF files (some of them over 30 thousand pages) in as less time as possible. After testing many tools I found Neevia PDFstamp. It did the job!

Avi Steinman

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