Title 10, Chapter 1, Section 670
Any provision of this article which would, in the absence of this
Code section, impair an obligation of a franchise agreement or any
other agreement between a manufacturer or franchisor and a
franchisee shall only apply to any such agreement made, entered
into, renewed, extended, modified, or continued after the effective
date of such provision. Otherwise, each provision of this article
shall apply to all franchise or other agreements.