YouView is being sued for alleged copyright infringement by Total Ltd, owner of the YourView mark.
The IPTV service recently lost a high court battle to gain a trademark for its name, after its initial application was rejected by the UK Trade Marks Registry.
A judge agreed with the original ruling that the proposed YouView mark is "confusingly similar" to YourView - which was registered on November 20th 2009.
Stuart Baikie, Managing Director of Total Ltd, said that despite the "recent vindication" of his firm's position in the appeal proceedings, YouView "had continued to act without regard" to its registered mark and business interests.
"We have had no choice but to issue infringement proceedings and we are confident of success," he stated.
Paul Gordon, Partner at Willans LLP Solicitors, said the YouView joint partners were fully aware of the YourView trademark when they attempted to register the name.
A number of broadband providers have launched IPTV services based on the YouView platform, including BT, TalkTalk and JT Global.