I believe anyone should be allowed to modify SV to their server's needs without having to disclose the source. Hence the license is now the MIT license. It's still a requirement to give credit however, which means servers using modified versions of SV should mention SuperVanish and where they got SV from somewhere on the server (e.g. in a custom command known by players or in the standard "/plugins" and "/version SuperVanish" commands).
Leon Mangler