They sell worldwide. Allwinner are the leading supplier of SoCs for tablets, and are especially popular in "second tier" tablets and phones. All those tablets you see for sale in shops that aren't iPads, but have strange unknown names and sell for $150 - they will have AllWinner-designed chips* and AllWinner-compiled kernels/userspace full of binary blobs. So you can go after that.

It's a real shame because their SoCs are cheap, powerful and very popular amongst Linux/ARM hobbyists - see http://linux-sunxi.org/Category:Devices

* Well, AllWinner cut and paste ARM cores together. I wonder if ARM have this much trouble with licensing too?

> I wonder if ARM have this much trouble with licensing too?

As far as I know, no. To actually produce chips Allwinner and others have to go through one of a small number of fabs. TSMC, Globalfoundries, UMC and Samsung will not make chips with pirated blocks.

IANAL, but I'd say the best bet would be to sue them in the US/Europe and try to get an injunction banning their products, much like the movie industry got DVDFab's domains and funds seized.