With the forced migration to Steam for CS 1.6, the old WON keys became worthless. Valve required users to "register" their old Half-Life CD key to their new Steam account. If you didn't have a legal key, you couldn't play CS 1.6 on secure servers.
There are several ways to obtain a Counter Strike 14 CD key: counter strike 14 cd key
You will not receive a "CD key." The game will simply appear in your library. With the forced migration to Steam for CS 1
If a website claims to sell a CD key for "Counter-Strike 14," it is highly likely a typo for an old version or a fraudulent link. The Evolution of the Counter-Strike Series counter strike 14 cd key