Thanks.
The current term of a copyright is for the life of the writer plus 50 years, I believe. I don’t know who owns or controls Jackson Browne’s copyrights, but it is entirely possible that this is a licensed use where the entity who does control that copyright granted it. It could be that Browne just personally doesn’t like it, but if he doesn’t control the copyright, I don’t think he can do much except complain. I’m sure he’ll still cash the check for his portion of the licensing fee, though.