Copyscape - Search engine to locate duplicated materials on the Internet. WebSheriff - Copyright infringement detection services. NRS-Online.com - US service for protecting and authenticating intellectual property rights. IP Innovations - Washington, D.C. based research company offering a title search facility to check for prior use. Copyright Aid - Information about copyright law, protection, registration, licensing, infringement and other aspects of intellectual property in the United Kingdom. HRC Watch - Database of contact information for the copyright holders of authors and artists whose works can be found in libraries and archives across North America and the UK. WorldWideOCR - Provides a service where members can store sealed, time stamped copies of their work online. Click&Copyright - Provides a filing service for submitting works to the U.S. Copyright Office. UK Copyright Service - Online copyright registration services. SampleSafe - Offers a service to register articles and works, and check for plagiarism, then downloads registered articles ready to send to clients. ProtectRite - Online intellectual property registration for accountants, entrepreneurs, artists, writers and other businesses.