How to monitor a Mouse right click copy event to restrict Clipboard in VB.net

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VB

I'm trying to make copy restriction for my applicaion. I have done the code for key board events like ctrl-c and ctrl-v but,

I could n't able to stop copying from mouse right click copy.

i have tried
Protected Overrides Sub WndProc(ByRef m As Message) Event,

Select Case m.Msg
Case Is = WM_DRAWCLIPBOARD
SendMessage(mNextClipBoardViewerHWnd, m.Msg, m.WParam, m.LParam)
End Select

But , for copy and paste both events are comming under this case.

Please tell me how to restrict mouse right click copy.