the WZ-10 isn't a copy, tho on initial inspection it looks to be a replica... there's sure still some kinks they need worked out before that thing goes fully active (it already is active??)
same for J-10 (it is not of Israeli descent, at least no longer)
the truth is, there was indeed a ban on sale of military goods to China, yes.
but the funny thing is, not everyone was for it, France, Germany, Israel... the rest is history... so anyways, the Chinese in China got around that by co-developing indigenous products with the various firms. now they have products that roll off of their own production lines in-country... thus not infringing on any bans or such...
all the bans and restrictions ever did was give them the impetus to gain self-sufficiency ... it does also mean that the next time anyone considers a ban, for them to consider its effects as well.
(opinions expressed are entirely mine own)