On CODESYS Forge you can grant rights on your published data to specific groups of users. There are only two virtual user groups, which you can't change:
Authenticated
Anonymous
Their purpose should be clear - Anonymous identifies all users, who are not logged in, while Authenticated identifies all others.
Then there are some more default groups, which you can fill with contacts. Those groups have default rights on specific actions in your project. You can change all of them, but the following tables should give you an overview.