In Windows 2008, Windows Vista, Windows 2008 R2, and Windows 7 you may experience issues with copy-and-past in a RDP session between client and server or server and client. If you need to allow copy-and-past functionality Disable the Do not allow clipboard redirection group policy.
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.
You can use this setting to prevent users from redirecting clipboard data to and from the remote computer and the local computer. By default, Remote Desktop Services allows clipboard redirection.
If the status is set to Enabled, users cannot redirect clipboard data.
If the status is set to Disabled, Remote Desktop Services always allows clipboard redirection.
If the status is set to Not Configured, clipboard redirection is not specified at the Group Policy level. However, an administrator can still disable clipboard redirection using the Remote Desktop Session Host Configuration tool.
Computer Configuration \ Administrative Templates \ Windows Components \ Remote Desktop Services \ Remote Desktop Session Hosts \ Device and Resource Redirection \ Do not allow clipboard redirection