In embodiments of the present invention improved capabilities are described for securely sharing computer data content that allows for the secure un-sharing of the content. The facility to un-share content may be implemented through a secure exchange server, where the content is being shared along with a secure protection feature that when altered results in the un-sharing of the content. This secure un-sharing facility may be used to securely share content beyond the secure protective facilities of an enterprise, out to users in other companies, into the public space, to users not intended to get the content, and the like, where the sender maintains control to access of the content no matter where or to who the content has been distributed. In this way, the secure sharing of content is made to be easy across corporate boundaries at the user level and at the individual document level.