CBS counters Nielsen's argument by reiterating that it sells most of its primetime ad inventory on a C7 basis (commercials + 7 days of viewing), which gives a broader view of how its programs are doing compared to the current standard of Live+SD or C3 (commercials + 3 days of viewing). With the network gearing up for Super Bowl LIII next month, a deal with Nielsen would be most helpful, albeit not required. CBS reportedly knows that it can get the Nielsen info elsewhere despite the ratings service warning companies not to provide their info to non-Nielsen clients, which CBS is currently. CBS is said to be considering its options and is interested in offerings provided by Nielsen rival comScore, which acquired measurement service Rentrak in 2016.