a system includes first circuitry in a first computing device configured to issue a credential , second circuitry in a second computing device configured to perform an operation corresponding to content at a third computing device based on the credential , third circuitry in the third computing device configured to receive a request to perform the operation corresponding to the content from the second computing device , and fourth circuitry in a fourth computing device configured to monitor communication between the first computing device , the second computing device and the third computing device .