Superdistribution is an approach to distributing digital products such as software, videos, and recorded music in which the products are entirely free of copy protection and are made publicly available and distributed in encrypted form instead of being sold in retail outlets or online shops. Such products can be passed freely among users on physical media, over the Internet or other networks, or using mobile technologies such as Bluetooth, IrDA or MMS (Multimedia Messaging Service). Over 280 models of telephones support superdistribution based on OMA DRM; companies such as Vodafone and Deutsche Telekom have been exploring it.