If you buy something, you own it.
If you buy a book, you own the book. You own the cover. You own the binding. You own the ink. You own the letters printed with the ink. You own the words that the letters form.
You also own the information that the words impart. The ideas, their expression, the narratives contained, etc.
You bought the book and it's yours. If you want to make copies and give them away for free, you can.
It's your book.
Copyright was the invention of a merchant elite who, motivated by the love of money (that is the root of all evil) sought to secure for themselves a monopoly right to certain works, under the guise of "authors' rights".
In effect, copyright puts control of the culture, its narratives and values, in the hands of the merchant class. It reduces all culture to a matter of profit. The love of money motivates it all. And copyright not only gives control of the culture to the merchants, but it incentivizes the perversion of the culture.
Every industry primarily reliant on copyright for its perpetuation is a cesspit of leftwing degeneracy and lies. Hollywood, the recording industry, the publishing industry. Damn nests of Marxists and pedophiles.
Nothing good has ever come of copyright. Nothing good can ever come of it. Nothing good can come of denying the property rights of millions of consumers just so a few authors can continue getting paid for work they did years ago, so rich leftist producers can shut down any competition, control what the masses watch, shape their culture into something base, make men hedonists whose disordered passions are easily exploited to sell them salacious media and pornography.
Before copyright, culture was largely shared, and organic. A creator of a work didn't get to stop people from passing it around. He did gain social prestige, which could be leveraged to make money. Look how much popular authors can get paid to give lectures, teach classes, etc.
Authors who wrote books to be published were paid upfront sums for first-run publishing rights. They didn't get to stop people from making copies. They couldn't keep making money on work they'd done years ago. But they could make a living.
Culture has always existed. It long predated copyright. Copyright had only debased it. But it will endure, and survive copyright.