Copyright empowers Congress to make a law giving you a limited term monopoly on your words or other creations. Patents do a similar for an invention. Both expire. Until they expire you can buy and sell or rent (license) these rights, and you can bring a civil case to enforce them.
Neither are like, say, a monopoly on a commodity like milk, which can be illegal or against regulations. Search for "patent" and "monopoly" and you will find innumerable actual lawyers explaining the monopoly nature of patents better than I can.
Could you find a good example, as I don't know what I'm looking for. On "copyright" and "monopoly", presumably, not "patent". Patents could legitimately create a monopoly on a good, if there's no other way to make that good.
Neither are like, say, a monopoly on a commodity like milk, which can be illegal or against regulations. Search for "patent" and "monopoly" and you will find innumerable actual lawyers explaining the monopoly nature of patents better than I can.