&gt; After you sign something, it&#x27;s not important if it&#x27;s reasonable or not: you have to uphold it.<p>It very much is important, and you don&#x27;t necessarily have to uphold it. In the vast majority of jurisdictions unreasonable[0] contractual clauses are unenforceable and may even be sanctionable.<p>[0] what is or is not unreasonable being the primary variable. CNC clauses are generally unreasonable in california (reasonable CNC are related to goodwill and shared businesses) for instance, and in mainland europe they are limited and often must be compensated for their whole duration e.g. in Germany the leaving employee must be paid <i>at least half their gross salary</i> for the whole CNC term (no more than two years) <i>and</i> unreasonable clauses can be invalidated, lest the whole CNC be invalidated.