US Patent 10013493 Customized search engines

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for receiving one or more search terms, providing the search terms as input to one or more user-specific indices, a user-specific index being generated based on an access privilege granted by a user to a data source, the data source including data that is specific to the user, generating search results based on the one or more search terms and the one or more user-specific indices, and transmitting the search results for display to a searching user.