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Example 2: Merge several PDF files and encrypt the output (VB.Net)  

   Dim NVmerge : NVmerge = CreateObject("Neevia.PDFmerge")
   NVmerge.PDFEncrypt = true
   NVmerge.PDFEncryptionType = "rc4"
   NVmerge.PDFOwnerPassword = "owner"

   ' p - document printing is denied
   ' e - disable extraction of text and graphics
   NVmerge.PDFPermissions = "pe" 

   Dim retVal : retVal = NVmerge.MergePDF("c:\1.pdf+c:\2.pdf", "c:\merged.pdf")
   if retVal<>0 then
     MsgBox "Error code=" & CStr(retVal)
   else 
     MsgBox "Done"
   end if

After testing PDFsign I can certainly say that it makes the signing of PDF documents easy for anyone who needs to perform such a task.

Martin Leary

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