That is exactly what I want.
> How long do you think the copyright terms should be?
Personally I think 20 years is a reasonable number. The original Copyright Act of 1790 established a term of 14 years with the option of one renewal. Remember that this was in the age of manual printing presses and horse-drawn wagons. In this age of on-demand printing and digital distribution 20 years is more than enough.
The copyright system isn't a right in the sense of speech or assembly, it's a temporary monopoly granted to an author in order to "..promote the Progress of Science and useful Arts..". Any aspect of copyright law which fails to promote those goals fails to uphold the constitutional foundation and ultimate purpose of the copyright system.
Copyright law exists in order to encourage authors to create by allowing them to benefit from their creation, but how does allowing a person to collect royalties on something they made 50 years ago promote creativity?