Much of the concept of "intellectual property". Here's a good essay by Richard Stallman:
https://www.gnu.org/philosophy/not-ipr.en.html
Copyright by and large needs to be abolished. Patents in software are nonsensical, and elsewhere they should be drastically scaled back. Trademark is alright, with a few adjustments needed.
But all of the above is hiding behind a concept of "property" that just does not apply to intangible things, and we need to stop using that term to describe them.