Many photo agencies use the web to sell access to their image collections. Despite significant security measures, images may be stolen and distributed, making it necessary to detect copyright violations. This demonstration paper describes a content-based system for large-scale automatic copyright enforcement. The paper briefly describes the image description, indexing and retrieval algorithm that lie at the heart of the system. It also describes our proposed demonstration, which is a realistic scenario of copyright violations of a large image collection. Categories and Subject Descriptors: H.2.4 [Database Systems]: Systems—Multimedia Databases General Terms: Algorithms, Performance