[twainer]

Expiring copyright and open-sourcing are not the same thing - but they can have the same result. That's a point I think tech-people don't think about enough. If my business is the creative work I've done, what right does an expiring copyright have to put me out of business? By placing my work in the public domain?

Open-sourcing code - though different from an expiring copyright - would create the same result in a business based on the ownership and public non-availability of that code.

Regarding the 'simple contract': contracts mean very little - leverage means everything. Granting very short-term copyrights removes all leverage from the owner of the work. His commercialization window grows very small and he is dependent on organized outside entities to 'make it happen' for him.

Patent coverage isn't even as short as a ten-year term mentioned in the OP. And patents are usually produced by it integrated firms that already have a huge commercialization apparatus running 24/7.