US Patent 7725453 Custom search index

A system includes an application programming interface, an indexer, a security unit and at least one search engine. The application programming interface uploads user-selected custom content from a first user. The indexer indexes the custom content to produce a first search index. The security unit authenticates a user and the at least one search engine receives a search query from the user, searches the first search index based on the search query, and searches a second search index based on the search query and based on results of the user authentication, where the second search index is different than the first search index.