Dragging of content from different domains within a window must be disallowed (Internet zone).
This policy setting allows you to set options for dragging content from one domain to a different domain when the source and destination are in the same window. If you enable this policy setting, users can drag content from one domain to a different domain when the source and destination are in the same window. Users cannot change this setting. If you disable this policy setting, users cannot drag content from one domain to a different domain when the source and destination are in the same window. Users cannot change this setting in the Internet Options dialog. If you do not configure this policy setting, users cannot drag content from one domain to a different domain when the source and destination are in the same window. Users can change this setting in the Internet Options dialog.
How this relates to the STIG checklist: STIG vs SCAP benchmark.