Digital Rights Management (DRM) technologies attempt to control what you can and can't do with the media and hardware you've purchased. Bought an ebook from Amazon but can't read it on your ebook reader of choice? That's DRM. Bought a video game but can't play it today because the manufacturer's "authentication servers" are offline? That's DRM. Bought a smartphone but can't use the applications or the service provider you want on it? That's DRM. Bought a DVD or Blu-Ray but can't copy the vide...
