As the importance of multimedia content in e-business grows, ever higher demands are placed on multimedia content management. The SUMMER-project focused on secure, effective and efficient retrieval of multimedia data. Advanced search techniques were developed to improve our ability to find specific items in huge multimedia data collections. These items, however, may contain sensitive information (e.g., license plates on cars) or may be of commercial value (e.g., digital art). Therefore, security mechanisms for authorization, access control and digital rights management were integrated in the retrieval process. Moreover, advances were made to develop data management middleware, which allows better integration of this technology with existing information systems.