system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] How do copyright laws work?

What law will prevent me from duplicating Bertie Bott's charm to create his every flavour beans or Nimbus Racing Broom Company's charm and marketing them as my own?
gpt
A lot charms are kept hidden from people to prevent these type of thing. If you don't know the charm, you can't copy it. 

Making doesn't just rely on one simple charm. There's a variety of complex charms with complex interactions. A broom is more akin to a magical artifact than an a simple magical item. These spells are common knowledge, but what prevents people from just mass-producing their own brooms is the amount of skill and work involved.