Trademark

In November 2004, CMP Media applied to the USPTO for a service mark on the use of the term "WEB 2.0" for live events.^[33] On the basis of this application, CMP Media sent a cease-and-desist demand to the Irish non-profit organization IT@Cork on May 24, 2006,^[34] but retracted it two days later.^[35] The "WEB 2.0" service mark registration passed final PTO Examining Attorney review on May 10, 2006, but as of June 12, 2006 the PTO had not published the mark for opposition. The European Union application (application number 004972212, which would confer unambiguous status in Ireland) remains currently pending after its filing on March 23, 2006.

Source: Wikipedia

http://en.wikipedia.org/wiki/Web_2