Of course. For example, the law guarantees that I don't have to perform labor for someone else if I don't want to. An employment contract obligates me to.
Similarly, it's entirely possible to enter into a contract limiting your freedom of speech.
The entire point of a contract is to promise to do, or not to do, something that you could have freely chosen to do or not to do under the law without any contract.
Similarly, it's entirely possible to enter into a contract limiting your freedom of speech.
The entire point of a contract is to promise to do, or not to do, something that you could have freely chosen to do or not to do under the law without any contract.