EJ, I think that the controlling phrase is “…person not authorized by that provider…”
Actually… the fine print in the acceptable use policy of just about all RESIDENTIAL service providers strictly prohibits the use of any user supplied IP translation devices (routers/access points), unless of course you spring for their “networking package”, which is usually crippled to 2 or 4 systems total.
Just about everyone who has more than 1 computer and their own router in their house is in violation of their ISP’s contract.
If we really want to split hairs here, everyone with a router should legally be paying for either several IP addresses, or the ISP supplied networking package.
To the OP… I’ll gladly trade you access on my Access Point for some lemons.