California Code, Penal Code - PEN § 31000

(a) Any person who lawfully acquired an assault weapon before June 1, 1989, or a .50 BMG rifle before January 1, 2005, and wishes to use it in a manner different than specified in Section 30945 shall first obtain a permit from the Department of Justice in the same manner as specified in Article 3 (commencing with Section 32650) of Chapter 6.

(b) Any person who lawfully acquired an assault weapon between June 1, 1989, and January 1, 1990, and wishes to keep it after January 1, 1990, shall first obtain a permit from the Department of Justice in the same manner as specified in Article 3 (commencing with Section 32650) of Chapter 6.

(c) Any person who wishes to acquire an assault weapon after January 1, 1990, or a .50 BMG rifle after January 1, 2005, shall first obtain a permit from the Department of Justice in the same manner as specified in Article 3 (commencing with Section 32650) of Chapter 6.

(d) On and after January 1, 2014, no partnership, corporation, limited liability company, association, or any other group or entity, regardless of how the entity was created, may be issued a permit to possess an assault weapon or a .50 BMG rifle.