Incidentally, what is the "legal status" of Scribd hosting a partial preview of works that they tell you are BY-NC (attribution/non-commercial use only) and tel

Incidentally, what is the "legal status" of Scribd hosting a partial preview of works that they tell you are BY-NC (attribution/non-commercial use only) and telling you to become a member to be able to view the whole thing? Is that not a commercial use?