Using “freer” to describe the difference between a modified BSD license and the GPL is confusing. Doing so leads to ill-defined conclusions:
The BSD gives greater freedom, the GPL gives more freedom.
A modified BSD license is better described as permissive in contrast to a license implementing copyleft. Some define freedom as the maximization of choice regardless of the effects upon others. However, is a society permitting unwarranted aggression toward others a “freer” society? Only the most obstinate argue so.