Which feature stops copying and pasting between a remote client PC and their host?

The feature that effectively stops copying and pasting between a remote client PC and their host is clipboard privacy controls implementation. This feature allows administrators to control the behavior of the clipboard when using remote desktop protocols or similar remote access technologies. By restricting clipboard access, sensitive information is safeguarded from being inadvertently transferred between the local machine and the remote session. This is particularly important in environments where data confidentiality is crucial, such as in organizations dealing with proprietary information or sensitive client data.

Even though the answer incorrectly states RDP Blocking as the correct option, RDP Blocking typically refers to limitations placed on the Remote Desktop Protocol itself, such as disabling the ability to initiate connections. It does not specifically target clipboard functionality. Therefore, the implementation of clipboard privacy controls is what directly addresses the issue of data transfer between the client and host through the clipboard.