with both copyrights and patents, fees should be just rise geometrically, yearly (but can be prepaid into the future). so for instance, the first year might be

with both copyrights and patents, fees should be just rise geometrically, yearly (but can be prepaid into the future). so for instance, the first year might be $1000, the second, $2000, and the 10th year, ~$1MM (a 2^n progression). by year 20, nearly every patent and copyright would be relinquished as the fee would be ~$1B. with those kinds of rates, even disney would have to innovate to stay large and relevant, rather than sitting on their laurels and collecting rents in perpetuity.