GM Prada's response specifically cited tools created by Electronics Arts.
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If you use a tool created by Electronic Arts and wish to charge money for the content created with that tool afterwards, then you are in violation of US Copyright law.
Many people, myself included, do not use Home Crafter or Body Shop in the creation of content. I use SimPe, Milkshape 3D & a paint program, none of which are created, produced or owned by Electronic Arts.
Does Prada's failure to include content created by these other tools indicate the exclusion of content created with them from the letter of US Copyright law?