I-Doser is an application for the playback of proprietary audio content. The developer claims the separately purchasable content aims to simulate specific mental states through the use of binaural beats, and much of it is named after prohibited recreational drugs.[1] The I-Doser player has been downloaded more than a million times[2] and is based on the audio technology of a GPL-licensed binaural beat generator, SBaGen.[3] The player can be downloaded for free, but the audio content has to be purchased.