Your CD key was tied to a unique ID. If you were caught cheating, that specific key was banned from servers worldwide. LAN vs. Online:
In the early 2000s, Counter-Strike was primarily distributed as a retail "Half-Life" mod or a standalone retail disc. To prevent piracy and manage server access, Valve and Sierra used a CD Key system: cd key counter strike 1.3
For offline installation and historical reference, various repositories document keys that were frequently used during the early 2000s: : 2186-42289-8687 Half-Life (Alternate) : 0500-13440-7344 Retail CS Key : 2440-93425-7041 Your CD key was tied to a unique ID
According to Steam Support , these keys were printed on a card or sticker included with the game's packaging. Common Legacy Formats cd key counter strike 1.3