Patent ID: 7539729

Claim:
A method to filter an electronic publication published by a content publisher, the method comprising: the content publisher registering the electronic publication with a server, the registering of the electronic publication including: assigning to the electronic publication, a randomly selected unique address to which the content publisher is to deliver content associated with the electronic publication; assigning a publication identification (ID) to electronic publication, and registering content of the electronic publication by computing a signature of the content and associating the signature with the electronic publication via the publication ID; receiving a further content at a client; receiving, at the server, a request from the client to determine whether the further content is registered; wherein the request including a further signature of the further content; determining that the further content is registered by using the further signature as a key to search for the signature at the server via the publication ID; providing the client with the publication ID based on determining that the further content is registered; the publication ID allowing the client to associate the further content with the electronic publication; wherein the publication ID allowing the client to automatically move the further content into a client inbox if the further electronic publication is on a subscribed list stored on the client; and the publication ID allowing the client to automatically block or move the further content into a client spam folder if the further electronic publication is on an unsubscribed list stored on the client.