I, for one, can completely understand the frustration you must be going through.
In my industry(clothing) the courts have ruled that any garment can be copied to a tee as long as the label doesn't denote the brand of the original. That means that I can copy any piece of clothing as long as I don't use their brand label.
I've had many graphic designs copied and used by other brands and, in the beginning, tried to sue them for copyright infringement but as long as they change some small element in the design they can claim that it is not an exact copy. It cost me a lot of money and stress only find out that I didn't have a leg to stand on and that my efforts were in vane.
As mentioned, you have to weigh whether the cost of litigating the issue is worth it in the end.
John
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