If IP is really property, subject it to property tax. The valuation is of course an estimate, but if it were ever sold, there'd be a tax credit or debit, in arr

If IP is really property, subject it to property tax. The valuation is of course an estimate, but if it were ever sold, there'd be a tax credit or debit, in arrears, without penalty but with sane interest. The only way to really get out of it is upon the expiration of the property's government granted monopoly status, i.e. turned over to the public.