definiens: means all Trademarks, including Trademark registrations and applications for Trademark registrations, ( a ) that are owned by or registered to Purchaser or its Subsidiaries ( inc luding any Purchaser Key Brands ) ; or ( b ) containing, comprisin g, or including ( but only to the extent they includ e ) any of the foregoing clause ( a ), including, in each case o f clauses ( a ) and ( b ), ( x ) all Trademarks that are confusingly similar to the Trademarks described in clauses ( a ) and ( b ) ( such that they could not be used in commer ce without infringing such Trademarks ), ( y ) all Internet Ident ifiers and telephone numbers or other alphanumeric addresses or mnemonics containing any of the foregoing and ( z ) the goodwill symbolized by any of the foregoing