Have you discussed this with a lawyer who specializes in these kinds of agreements? Eric Goldman has written extensively on these types of amendment clauses (and has a very unfavourable opinion of them): http://blog.ericgoldman.org/archives/2015/01/safeway-cant-un... http://blog.ericgoldman.org/archives/2014/03/court-blesses-i... http://www.forbes.com/sites/ericgoldman/2012/10/10/how-zappo....