The Policy Expert: RDS: Do Not Allow Clipboard Redirection
Specifies whether to prevent the sharing of clipboard contents (clipboard redirection) between a remote computer and a client computer during a Remote Desktop Services session. By default, Remote Desktop Services allows clipboard redirection. If the status is set to Enabled, users cannot redirect clipboard data.
Read the full blog post: https://calcomsoftware.com/the-policy-expert-rds-do-not-allow-clipboard-redirection/