The code is licensed under the plain MPL 2. It is not considered Incompatible with Secondary Licenses. Making code Incompatible with Secondary Licenses requires an active choice on the part of the licensor; it is not the default. The notice in Exhibit B is not considered "attached" merely by being present as the Exhibit B of a copy of the full MPL 2. The only exception is if the code used to be straight MPL 1.1 and was upgraded to MPL 2, in which case it would be Incompatible with Secondary Licenses (Sec. 1.5 b).