License / Registration key enabled software

[Steve Holden]

Sybren Stuvel wrote:
> Mike Playle enlightened us with:
> 
>>Imagine you're an IT manager for a medium-to-large company who wants
>>to use some expensive piece of software. You talk to the vendor and
>>buy a licence to use the software on up to 5 machines at once, but
>>you don't know who in the company will want to use it, so for
>>convenience you want to install it on every PC in the building.
>>
>>Having installed it all over the shop, how can you be sure that only
>>5 people are using it at any one time?
> 
> 
> Write the software in such a way that it needs a certificate on a
> smartcard, then supply the company with five smartcards.
> 
And you guarantee that the contents of the smartcard is only used by one 
user at a time by building a licensing system for the smartcards?

regards
  Steve
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