the chinese government have no respect for patents or copyrights- they just allow their company's to pirate other designs and then mass produc them using other materials.
You can't copyright an aquarium filter. :headshake2:
I looked in the USPTO database and found 12 Eheim patents, but none of them appear to be applicable to the Pro II.
It thus appears the design is in the public domain, and avaible for copying by others.