 Someone who has a pair of privilege rights—no duty to perform the action, no duty not to perform the action—is free in an additional sense of having discretion over whether to perform the action or not. For example, you may be free to join a protest march, or not, as you like. This dual non-forbiddenness again does not imply physical ability. A rightholder may be permitted to perform or not perform some action, but this still does not mean that she is capable of performing the action that she is free to perform.