Ability and permission are not often link like this in real life.
If I walk up and stand two feet infront of someone I have given them the ability to try to punch me in the face, I have not given them permission to do so.
If I utilize a computer repair service and I grant them remote access to a computer at their request I have likely given them the ability to run the equivalent to rm -rf /, but I have not given them permission to.
I can grant a friend access to my house by giving them a key that does not mean I give them the permission to do what ever they want in my house.
In the above three cases there are legal consequences for a party when overstepping their permissions.
If I walk up and stand two feet infront of someone I have given them the ability to try to punch me in the face, I have not given them permission to do so.
If I utilize a computer repair service and I grant them remote access to a computer at their request I have likely given them the ability to run the equivalent to rm -rf /, but I have not given them permission to.
I can grant a friend access to my house by giving them a key that does not mean I give them the permission to do what ever they want in my house.
In the above three cases there are legal consequences for a party when overstepping their permissions.