The Patent Trial and Appeal Board on Tuesday sided with Comcast in its broad-reaching patent war with TiVo, negating TiVo’s claim that a Comcast X1 feature that lets users watch a channel while recording a show on another network violates one of the tech company’s patents. In its final decision, the board invalidated Patent No. 8,621,512, held by TiVo’s Rovi division, ruling that the technology would be “obvious” to anyone engaged in the “art” of designing digital video recorders.

Neither Comcast or TiVo responded immediately to Multichannel News’ request for comment.

TiVo has successfully carved out technology licensing deals with most major constituents in the pay TV business. But Comcast has been a notable holdout. The two parties have sued each other in federal court, with Comcast contesting a reported three-dozen patents held by TiVo’s Rovi and Viveo operating units.