I don't think they will or can.How will WOTC prevent "group" memberships to DDI? Will/can they prevent multiple use of login/password?
For example, your gaming group splits the cost and get's one membership.
jh
The range of dynamic IPs that my home ISP uses is huge. Also, I would be very annoyed if I couldn't log on to my account from different computers.There's no way to tie it to a specific IP, or even range of IPs for anything but concurrent access. And the overhead for that would be a nice performance killer.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.