While the term "torrent" describes a peer-to-peer (P2P) file-sharing method, using it to download copyrighted games like Modern Warfare 3 is illegal and carries significant risks:
Retail DVD versions and legitimate digital copies require official server authentication. Torrents often lack access to official multiplayer modes. Where to Legally Buy and Download Modern Warfare 3 Call Of Duty-Modern Warfare 3 -PC-DVD--RETAIL- Torrent
If you have a physical copy, you can still install it, but note that modern versions often act only as a license key and still require a large digital download through the Call of Duty HQ . System Requirements for Modern Warfare 3 While the term "torrent" describes a peer-to-peer (P2P)