I'm no lawyer, but I think they would NEED to have the name "Poser Store" trademarked, not copyrighted, to be able to do anything to you because of it. A unique name can be trademarked, but not copyrighted. Those are two different things, reserved for different purposes. I believe it could be trademark infringement, but only if they have actually registered Poser Store as a trademark. Again, I'm no lawyer, but I do have some experience in trademarking names and logos, since I've done that sort of thing before.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.