DRM is software that stops media or other software from working on your machine. It could be based in individual authorization, license key, or it could be something like a geo check.

Providing or not providing a service based on a region could be done with DRM (as I mentioned at the end of the previous example), or I could block IPs in that region, or I could require information to use the service that people in different regions may not have (ie SSN), or I could simply ask the user where they are and not service them if they are in certain regions.

Claude is not running on end users computers. If it were and they were restricting use within certain regions, that would be done with DRM.