This would mean the bandwidth problem would go away.

Fair point - though you resolve the big issue of when theres no internet connection?

I've bought stuff before that needs to be authenticated online when installing.  Gone to reinstall and they've either gone bust. Or worse still decided  they don't want anyone to use that version anymore, you have to pay extra.

Simple serial number ? No problem.

Pinky - you left the lens cap of your mind on again.