“Cisco Systems this week filed a federal lawsuit against TiVo, seeking to void four of the DVR maker’s patents — including the infamous “Time Warp” patent that Dish Network was found to have infringed — opening a new front in the litigation battle over cable set-tops.

TiVo declined to comment.

Separately, TiVo is suing two of Cisco’s big service-provider customers — Verizon Communications and Time Warner Cable — alleging patent infringement, and has legal action pending against Motorola Mobility as well.”

See original here