Well, they're not that kind of knockoffs. They are fully legal (some are EU based), and one of those companies even have the Star Trek license, which is great.
Really, take a look around, it isn't like that at all.
I understood knockoffs as having the same offering but cheaper, but that wasn't really what you meant. After a quick Google it seems you mean brands like Cobi?
Really, take a look around, it isn't like that at all.