In the Third Circuit, common law generally governs the use of restrictive covenants. States in this Circuit employ a reasonability standard to determine whether a restrictive covenant is enforceable. In New Jersey, even if a covenant is found to be reasonable, it may be limited in its application by: geographical area, period of enforceability or its scope of activity. Pennsylvania also uses common law to determine if a restrictive covenant is enforceable but restrictive covenants are generally disfavored.