13. The non-transitory computer-readable medium as in claim 8 , wherein propagating, by the federated broker, the plurality of translated queries and the plurality of user credentials to each corresponding source to appear to each corresponding source to be the authorized user is implemented in a single sign-on (SSO) federation environment.
14. The non-transitory computer-readable medium as in claim 13 , wherein the SSO federation environment protects the federated broker from unauthorized access.