Super Bowl Ad Will Stress Safety

To the usual lineup of beer and car commercials on Super Bowl Sunday, add this: one about player safety.
For the first time, the N.F.L., currently the target of more than a dozen lawsuits accusing it of deliberately concealing information about the effects on players of repeated hits to the head, will use one minute of its own commercial time during its signature event to address player safety, its most critical and sobering problem.