On Wed, 2008-04-23 at 11:28 -0700, tim Rowledge wrote:
> On 23-Apr-08, at 10:35 AM, Norbert Hartl wrote:
> 
> > On Wed, 2008-04-23 at 15:00 +0200, Javier Reyes wrote:
> >> Hi Edgar,
> >>
> >> It's for a licensing server. I think I've found a way to do it using
> >> the ethernet physical ID trough:
> >>
> >> Applescript doIt: 'do shell script "ifconfig en0"'.
> >>
> >> And then filtering the physical address.
> >>
> > This won't work. Usually the MAC address shown is only a copy
> > of the number stored on the device. You can alter this address
> > easily.
> I assume simply replacing the ethernet card - or even just adding one  
> and reassigning which is en0 - would mess it up pretty badly.
> 
> Many CPus have an actual unique ID that is findable somewhere. Even  
> there you're in trouble if the cpu has to be replaced due to failure  
> of upgrade.
> 
> 
Yes, that is hardly avoidable. I think that's the reason so many 
companies still use some sort of dongle. 

Norbert