I've rewritten every NCA/NDA that I've been told to sign as a "condition of employment" because they are entirely too restrictive. If I followed most as the letter of the law, I wouldn't be able to write T-SQL for any other company ever again.
Oddly enough, most of the companies have agreed with my rewrite. Unlike the original, I do make it fair and reasonable.
--Jeff Moden
Change is inevitable... Change for the better is not.