Tumbleweed Communications Corp. has filed a patent infringement lawsuit against online greeting card service eUniverse, Inc. Tumbleweed recently signed patent license agreements with American
Greetings Corp. and privately held Hallmark Cards, Incorporated, each of which competes with eUniverse in the online greeting card industry. Tumbleweed's U.S. Patent No. 6,192,407 ("Private, Trackable
URLs for Directed Document Delivery'") covers technology that allows online providers to uniquely bind content to a digital identity, enabling a host of applications such as online marketing and
security content delivery.