A mark licensed by a group that has established certain criteria for its use, such as "U.L. Tested" or "Good Housekeeping Seal of Approval," is known as a service mark.

A mark licensed by a group that has established certain criteria for its use, such as "U.L. Tested" or "Good Housekeeping Seal of Approval," is known as a certification mark, not a service mark. A service mark is used to identify services offered by a particular entity, distinguishing them from services provided by others.