my .02 worth

Most companies say....whatever YOU design while I am paying you, is MINE. No
discussion required.  And, as long as you don't compete WHILE employed, all
is well.  If you leave, and join a competing firm, you can't take anything
with you except the knowledge in your head.  That's why engineers are
sometimes paid more, so they will stay.  If you leave for benefits or more
money, and you are worth it, the present employer will typically try to
match.  I would not sign anything that precludes you from leaving and
immediately working for someone else...

......
by night and weekends....industrial control design
by day.....digital video design