>You should be able to tell by the copyright date if something has expired.
That’s a good idea.
Fifteen would probably be a better number than fourteen though... unless you can give me a reason you chose fourteen, that is.
I chose 14, because that was the original term, though they also gave you the ability to renew it once, for a total of 28 years. I think the renewability is a bad idea, because it generates uncertainty and fees for lawyers. One fixed term of definite length is better IMO. (This is one of the few things I'd second-guess the founders on.) :-)