A strategy is described for controlling access to a resource which is shared between a trusted environment and an untrusted environment. The resource can represent a clipboard module. The trusted environment can include trusted client functionality, while the untrusted environment can include potentially untrusted network-accessible entities (e.g., websites) which seek to access the clipboard module. The strategy provides a security presentation which notifies a user when a network-accessible entity is attempting to access the clipboard module, identifying the entity which is making the attempt, together with the nature of the information being read or added to the clipboard module. The security presentation invites the user to approve or deny the particular attempt (or all such attempts from the network-accessible entity), and/or clear the clipboard module. The security presentation does not block the user's interaction with other parts of a user interface presentation.
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