Sports betting tech provider CG Technology has sued daily fantasy sports operators DraftKings and FanDuel, claiming that the operators are infringing on multiple CG Technology patents.

Last week, CG Technology (the former Cantor Gaming) filed separate complaints in Nevada District Court against the DFS operators, accusing them of violating seven patents owned by CG Tech. The suits list two co-plaintiffs; the Nevada-based Interactive Games LLC and UK-based Interactive Games Ltd.

CG Technology, which provides land-based and online sportsbook technology for eight Las Vegas casinos, says the DFS operators are infringing patents covering the transmission of identification codes and game control signals to a processor, which allows the sites to accomplish all sorts of necessary tasks, including identifying players, tracking results, and generating user pay records and other information.

The suits indicate that CG Technology sent cease-and-desist letters to the DFS operators as far back as July 2014. CG Technology says it attempted to reach a “negotiated non-litigation arrangement” with the DFS operators but was rebuffed, leaving it no option but to sue to protect its “innovative technology.”