A former employer of mine (5 years ago) just sent me an email out of the blue with an updated Intellectual Property Agreement notably more complex than the one I recall signing when I started with them. I don't really have any interest in their IP or anything I worked on with them, but I also don't really like needlessly engaging in contracts, especially with people I don't feel like I left with the best terms (I quit because they were being super shady).
The agreement looks relatively straightforward, though some of the clauses look suspiciously like non-compete agreements, and I don't see a particularly compelling reason why I should sign. What's the worst that happens to me if I don't sign (or even acknowledge) this agreement, assuming I don't do anything to violate my original agreement or anything otherwise damaging/malicious to them?
Both me and the company in question are in CO, USA.