[jakubw]

What I had in mind were not services but rather Siri clients for non-Apple hardware, which I assume Apple would not be particularly happy about. When Siri comes to iPads and Macs, owners of a much broader range of devices could take an ID and use it, for instance, in an unofficial Siri client (should one be created) on an Android device. But then again, I may be way overthinking this.

[hmottestad]

Probably. Take note of the fact that OS X editions don't use a serial number. You can very easily share them with friends and family and online. Same goes for iWork, however some of the more expensive software does use SN.

If you already bought an iphone/mac/ipad (in the future) that has Siri, then I don't think apple will care much if you use siri on other devices. However what is really useful with siri is where it talks to the os layer and other applications. That kind of integration isn't all that easy to do.

So if someone writes an app with the integration to the os and apps (calendar, sms, phone, phonebook...) and decide to use Siri (illegally), then I think they deserve a medal or soemthing for their hard work for porting the siri front end to another platform.

[schiffern]

Duplicating Siri involves much more than just speech-to-text -- the language understanding is the hard part. Heck, Google has its own speech-to-text servers.