If you found a website offering a “Tekken 6 license key,” it’s almost certainly a scam or a malware risk. I’d be glad to help you find legal ways to play the game or discuss Tekken 6 ’s features, characters, or story instead.
Depending on your platform, here is how you can officially obtain or use a license key for Tekken 6: PS4 & PS5 (PS Plus Classics) : The most modern way to play is through the PlayStation Plus Premium/Deluxe Tekken 6 License Key
Julian grabbed his stick. "Load it up."