pierre,
It's not about commercial or non-commercial, it's about the age of the model in the image. In the US, there has to be proof of age if the girl appears to be underage. Such proof keeps Rosity out of trouble, if someone should consider such an image to be illegal. In photography, that can become an issue.

In Poser textures, since the end picture does not display the actual person, I doubt the same stipulation would apply there. Besides, I seriously doubt that texture makers are taking naked pictures of their kids to make textures.

ShadowWind