My understanding is not more than 2 devices can be logged in at the same time. I have sky demon on 3 devices and if I forget to log out then extra device is automatically logged out. It is a safe guard to prevent abuse. It can be a bit of an irritant but you merely need to log out then re log in on the machine you wish to use.

An easy general question on subscriptions:

SD subscriptions cover two mobile devices and two computers. Say I'm currently using SD on my iPhone and my old iPad. I will soon buy a new iPad to replace the old one.

Question: When I have the new device, how can I change my subscription from the old iPad to the new iPad?

Thanks