Serial Keys To Mont And Blade Where Can I Get A Serial Key To Play Counter Strike Online?

Where can I get a serial key to play counter strike online? - serial keys to mont and blade

I bought the property from previous games. It included Counter-Strike: Condition Zero and Half Life 2 with Counter Strike Source.
Unfortunately, trying to play online, which says that the keys have the serial number with these games are already registered by the owner, this could happen. Said after contact with steam, there is nothing they can do.