Fundamentally, the stuff we call “intellectual property” is just knowledge – ideas, words, tunes, blueprints, identifiers, secrets, databases. This stuff is similar to property in some ways: it can be valuable, and sometimes you need to invest a lot of money and labour into its development to realise that value.
But it is also dissimilar from property in equally important ways. Most of all, it is not inherently “exclusive”. If you trespass on my flat, I can throw you out (exclude you from my home). If you steal my car, I can take it back (exclude you from my car). But once you know my song, once you read my book, once you see my movie, it leaves my control. Short of a round of electroconvulsive therapy, I can’t get you to un-know the sentences you’ve just read here.
— Cory Doctorow, “Intellectual property” is a silly euphemism