Patent – Infringement. The second claimant (Rovi) issued proceedings for infringement of its patent against the first two defendants (Virgin) in respect of one of Virgin's set-top boxes. Virgin conceded infringement, but counterclaimed for revocation on grounds of anticipation and obviousness over three forms of prior art. The Patents Court held that the relevant patent claims were obvious over one form of prior art and fell to be revoked. Since no claim survived, there could be no question of infringement and Rovi's action was dismissed.