Edit: Changed title to be more accurate.
Also here is the summary from Wikipedia on what Post-scarcity means:
Post-scarcity is a theoretical economic situation in which most goods can be produced in great abundance with minimal human labor needed, so that they become available to all very cheaply or even freely. Post-scarcity does not mean that scarcity has been eliminated for all goods and services but that all people can easily have their basic survival needs met along with some significant proportion of their desires for goods and services. Writers on the topic often emphasize that some commodities will remain scarce in a post-scarcity society.
Create a system of attribution, where by new products and inventions acknowledge the work they’re based on (and they acknowledge the work they’re based on etc), and then have a system that takes total sales volumes etc and splits a portion of government money to all the inventors / creators based on how popular their product was. Fund it with a small increase on sales tax for all products, then there’s no incentive to not provide attribution since it doesn’t effect your take home pay regardless, and have a system for applying for attribution when you think it wasn’t fairly given to you.
We spend billions and billions of dollars on our current patent system and the legion of lawyers required to maintain it, there’s more than enough resources to build a system that’s not based on scarcity.