It’s all the same, and you can also add patents, according to people who use the term “intellectual property”.
Seriously though…
* Copyright is a set of rules governing reproduction and usage of creative works.
* Trademarks deal with company identity protection.
* Patents ensure a time-limited monopoly on usage of an invention.
Copyright is what forbids you from copying a Beatles record for a friend. Trademark is what forbids you from stamping “Disney” on children’s books you write and publish. Patents is what forbade you to produce and sell sildenafil (viagra) until 2017 (though the molecule had been sold by Pfizer since 1998).
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