XDCC refers to IRC bots running file sharing programs. XDCC bots serve one or more usually large files for download using the DCC protocol. Its use is widely understood to be a protocol extension by which illegal content, usually MP3s or warez, can be listed and, subsequently, downloaded.Frequently, warez groups utilize connections with fast upstream speeds in order to mass distribute their releases (usually ISO images compressed using the RAR algorithm, with other files packaged together as a tar file). XDCC is quickly gaining popularity over older methods of computer piracy such as newsgroups and fserve . Unlike peer-to-peer transfers, XDCC is often hosted on connections with massive upstream bandwidth, the most popular dumps (server computer with pirated software) are usually connected to sites with 100Mbit connections.
To use XDCC one private messages a bot using an IRC client. The user can ask a bot what files it has by private messaging "xdcc list" to the bot. However, this feature is often disabled as to not attract too much attention. When a user wants to download a packet, or file, from a bot the user would type something such as "xdcc send " to the bot. The bot will either start sending the user the packet or the bot will place the user in a queue, or in a line, and force the user to wait their turn.
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