Well. You could always let the yearly payment grow uncapped. Assuming it grows faster than the rate of inflation at some point it would almost assuredly be in t

Well. You could always let the yearly payment grow uncapped. Assuming it grows faster than the rate of inflation at some point it would almost assuredly be in the interest of any holder to release a copyright. Another idea. Letting cost rise uncapped would eventually cause any holder to not re-register but is bad for smaller entities that hold copyrights. Capping the long-term re-registration cost while still having a long time limit could be a decent blend. Mickey Mouse is trademarked which is perpetual so it seems like the copyright on some cartoons would expire but it still wouldn't open the floodgates to any random person making their own Mickey cartoon series as Disney would vigorously enforce their trademark. Edited: Added another thought. On more edit: Trademark vs. Copyright