Starting in the 2000s, the popularity of digital downloads through BitTorrent made it possible to replace physical media with virtual box sets of BBC material provided by fans for fans made available free of charge. In 2004, Purple Chick released "The Complete BBC Sessions Upgraded" as a digital set of ten audio CDs plus one multimedia CD. In 2010, Hobnail released a virtual 13 disc release "Unsurpassed Broadcasts". 2015 saw the release of "The BBC Archives", by an anonymous source. This set of 23 virtual CDs and one virtual DVD contains all of the available BBC material in the best quality, as well as some previously unreleased radio shows and upgraded material.