i want to know if hacker can copy my game if my game is copylocked? and i want to know how to keep my game secure and cannot be copy by other people or some dangerous hackers
The server-side contents of Workspace
, Lighting
, ReplicatedStorage
, etc. replicate to all clients. This is a good thing; without it, they would not be able to render/use the contents of these services.
The downside of this, however, is that malicious users can copy the contents of these services and save them to their computer (after all, the contents literally exist on their computer after being downloaded from the server). This really isn't that much of an issue. First of all, nobody is going to bother stealing assets from your game until it is popular, at which point the chance of their copy ever gaining traction is tiny. Either way, you can report any instances of place stealing to Roblox to have them take appropriate action against the culprit; the stealing of assets is illegal, after all.
In the end, it's best to focus on other areas of development rather than waste your time worrying about malicious users who want to steal your game.