I&#x27;m a fan of this, it seems easier to apply and harder to hide how much you say you&#x27;re profiting from it. It also represents the trade with the public for protection. The longer it&#x27;s out of the public domain, the more you have to pay the public.<p>You could have this increase as a percentage each year, allowing a slow ramp up and <i>much</i> higher fees for something that&#x27;s been kept for 100 years.