also prevent these cd keys from being used with <a class="el" href="structRakNet_1_1CDKey__Use.html" title="Associates a cd key with a user, such that the cd key cannot be used again. If Client_Login() is call...">CDKey_Use</a>. If this key is already in use by certain users for this particular title, then log this similarly to how <a class="el" href="structRakNet_1_1CDKey__Use.html" title="Associates a cd key with a user, such that the cd key cannot be used again. If Client_Login() is call...">CDKey_Use</a