The Cache Discovery Protocol (CDP) is an extension to the BitTorrent file-distribution system. It is designed to support the discovery and utilisation of local data caches by BitTorrent peers, typically set up by ISPs wishing to minimise the impact of BitTorrent traffic on their network. The Cache Discovery Protocol was originally developed jointly by BitTorrent, Inc. and CacheLogic and first implemented in version 4.20 of the official BitTorrent client, released June 22, 2006. However, despite claims that the details of the protocol would be published, to date no specification has been made publicly available.
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| Companies | BitTorrent, Inc. · Azureus, Inc. |
| Individuals | Bram Cohen · Ashwin Navin · Ludvig Strigeus |
| Technology | Tracker · Client · Super-seeding · Peer exchange · Distributed hash tables · Broadcatching · Protocol encryption · Terminology · DNA (Delivery Network Accelerator) |
| Clients | BitTorrent (original client) · ABC · Azureus · BitComet · BitTornado · Deluge · KTorrent · LimeWire · rTorrent · Shareaza · Transmission · µTorrent · FrostWire |
| Search engines | Btjunkie · isoHunt · mininova · myBittorrent · The Pirate Bay · Suprnova.org · TorrentSpy · |
