2000s
In computer science terms, modern file sharing begins in the 2000s. Several file sharing protocols and file formats were introduced, along with nearly a decade in protocol experimentation. Towards the end of the 2000s, BitTorrent became subject to a "man in the middle" attack in TCP mode – and this has led most file sharing protocols to move to UDP towards the very end of the decade. Client and tracker software in this era was in development as much as the transmission protocols, so the file trading software was not always as reliable as it could have been.
Read more about this topic: Timeline Of File Sharing