CUSTOS Technologies was founded by Prof Gert-Jan van Rooyen, Dr Herman Engelbrecht and Frederic Lutzfrom Stellenbosch University. CUSTOS allows media companies to dissuade consumers from illegally sharing media they've purchased. Their technology uses cryptocurrency, like bitcoin, a medium of exchange that relies on cryptography to secure financial transaction and control availability. The system embeds a unique code into each media file that unlocks a cryptocurrency deposit. If a media user illegally share files they've been granted access to, someone close can find the code and anonymously claim their deposit.