Dvv Auth makes and checks license keys. You (the developer) sell your keys and you're responsible for your app and your buyers.
Not allowed: malware, stealers, RATs, or anything that harms the people running it; cheats, exploits or scripts that break a game's or platform's rules (Roblox included); anything illegal. Apps like that are deleted without warning and the account is banned.
It's free and comes with no guarantee: it can go down, change, or close. If it closes, keys stop being checked - build your app so you can move. Don't put personal info in key notes.
Questions: discord.gg/DVV