VB6 prevent receipients copying/forwarding LotusNotes emails??

[mingichu]

Hi! All experts,

We use VB6 to send Lotus Notes emails with attachment automatically.
In order to improve security, we want to add codes to encrypt the emails/attachments and prevent the receipients forwarding/copying emails to others.
I got encrypting part solved by trying both methods and both worked the same to me
1. NotesDoc.ENCRYPT
Call NotesDoc.Save(True, True)
2. NotesDoc.ENCRYPTONSEND = True

But, I couldn't find the codes for the 2nd part: preventing receipients forwarding/copying emails to others.

Can anyone help me? Thanks!!