Methods and related systems for indexing the contents of documents for comparison with the contents of other documents to identify matching content. A method for comparing the contents of a query document to the content on the World Wide Web is set forth. The contents of a query document are indexed...http://www.google.com/patents/US6757675?utm_source=gb-gplus-sharePatent US6757675 - Method and apparatus for indexing document content and content comparison with World Wide Web search service
