US Patent 7917846 Web clip using anchoring

Methods, computer program products, systems and data structures for generating a signature for a portion or portions of a content source are described. The signature can be generated by identifying a portion or portions of a content source, and determining a signature that defines the portion or portions. If the source is updated, the signature can be retrieved and compared to elements in the updated source. If an element in the updated source matches information included in the signature, content corresponding to the matching element is displayed.