Follow these steps to disable copy/paste in RDP Connections. We implemented this for our VPN clients.
On the Domain Controller, open up Group Policy Management. Create a new GPO under your workstation and link a new policy. Name is something like “DisableClipboardInRdp” or something.
Navigate to: Computer Configuration\Policies\Administrative Templates\Windows Components\Remote Desktop Services\Remote Desktop Session Host\Device and Resource Redirection
Set the “Do not allow clipboard redirection” and “Do not allow drive redirection” to “Enabled”.
Update your workstations to receive the new policy by “gpupdate /force” from an admin cmd. Then run rsop.msc, or preferably gpresult /h “c:\scripts\report.html” to see if it has been applied.