(probably returns another value - maybe 1 - if current environment is secure, but there's no known way to make it secure by ourselves, only Blizzard can)
local secure = issecure(); if not ( secure == nil ) then DEFAULT_CHAT_FRAME:AddMessage("OK! Current environment is secure; we may call Protected functions !"); else DEFAULT_CHAT_FRAME:AddMessage("Current environment is not secure; calling Protected functions will show up Forbidden popup !"); end
Executing this script will always show up "Current environment is not secure; calling Protected functions will show up Forbidden popup !" in your chat frame :'(
This function should always return nil to any third party AddOn/macro maker. Only Blizzard UI coders would be able to make it return another value than nil.