California Code, Corporations Code - CORP § 7320

(a) Unless the articles or bylaws otherwise provide:

(b) The articles or bylaws may provide for, or may authorize the board to provide for, the transfer of memberships, or of memberships within any class or classes, with or without restriction or limitation, including transfer upon the death, dissolution, merger, or reorganization of a member.

(c) Where transfer rights have been provided, no restriction of them shall be binding with respect to memberships issued prior to the adoption of the restriction, unless the holders of such memberships voted in favor of the restriction.