By claiming intellectual property rights on the data in the book or CD or game I bought, you are claiming partial ownership of my property. That violates my property rights. I bought it, and I bought the whole thing, Data included.
Suppose I offer to sell you a car for $1,500. Then I say, "I tell you what, you can have it for $1,200, but if you drive it on a Saturday between 2AM and 3AM local time, you must pay me $15." Is that enforceable?
You bought whatever your agreement with the seller says you bought. That agreement includes the laws of your jurisdiction unless you negotiate otherwise.