account. Users can access their saved games and achievements providing the main owner is not playing. When the main player initiates a game while a shared account is using it, the shared account user is allowed a few minutes to either save their progress and close the game or purchase the game for his or her own account. Within Family View, introduced in January 2014, parents can adjust settings for their children's tied accounts, limiting the functionality and accessibility to the Steam client and purchased games. In accordance with its acceptable use policy, Valve retains the right to block customers' access to their games and Steam services when Valve's Anti-Cheat (VAC) software determines that the user is cheating in multiplayer games, selling accounts to others, or trading games to exploit regional price differences. Blocking such users initially removed access to his or her other games, leading to some users with high-value accounts losing access because of minor infractions. Valve later changed its policy to be similar to that of Electronic Arts' Origin platform, in which blocked users can still access their games but are heavily restricted, limited to playing in offline mode and unable to participate in Steam Community features. Customers also lose access to their games and Steam account if they refuse to accept changes to Steam's end user license agreements; this last occurred in August 2012. In April 2015, Valve began allowing developers to set bans on players for their games, but enacted and enforced at the Steam level, which allowed them to police their own gaming communities in a customizable manner. Storefront features The Steam client includes a digital storefront called the Steam Store through which users can purchase computer games. Once the game is bought, a software license is permanently attached to the user's Steam account, allowing them to download the software on any compatible device. Game licenses can be given to other accounts under certain conditions. Content is delivered from an international network of servers using a proprietary file transfer protocol. As of 2015, Steam sells its products in US and Canadian dollars, euros, pounds sterling, Brazilian reais, Russian rubles, Indonesian rupiah and Indian rupees depending on the user's location. In December 2010, the client began supporting the WebMoney payment system, which is popular in many European, Middle Eastern, and Asian countries. From April 2016 until December 2017, Steam accepted payments in Bitcoin with transactions