Mozilla's experience with MPL 1.1, and the experience of some of our advisors, was that in practice license incompatibility is often resolved by the use of custom additional permissions or dual- and tri- licenses. Each combination of dual or tri-license, or custom additional permissions, further complicates license interaction and proliferation analysis. We feel that Sec. 3.3, by replacing these ad-hoc solutions with a single, standardized solution for the most common situation, should reduce, rather than increase, the practical risk of license proliferation.