I like this solution we came up with a few years ago: https://news.ycombinator.com/item?id=16163984 https://news.ycombinator.com/item?id=16163984 Ten years of

I like this solution we came up with a few years ago: https://news.ycombinator.com/item?id=16163984 https://news.ycombinator.com/item?id=16163984 Ten years of free protection, then costing $10 × 1.5 ⁿ ⁻ ¹ for each subsequent year. Year 10 costs $0, year 20 about $380, year 30 about $22,000, year 40 about $1,300,000, year 50 almost $75,000,000—and few fifty-year-old things will be worth $75,000,000 per year and growing to retain copyright to.