I didn't see any place where they were selling the images. Also my Spanish is not the greatest either but I think the copyright on the bottom says that the images belong to the authors... not that the owner of the web site is claiming to be the author. From what I gathered it looks more like the site is used to get reviews of the images along with email addresses. Regardless it is still really messed up.

Dave Cooler may be able to help, he works for Curious Labs and Daz to help prevent piracy. From what I heard he is a copy write attorney that just happens to dig Poser.
CoolerBear@att.net, if this address is not current try to get in touch with someone at Daz. He is your man for cease and desist letters.

I hope this helped,
Christian