Naturally, one cannot use these files for commerical use without premission of the original producer. However, they can be used for private and non-commerical use. You will also need the Vocaloid 3 software, either full or tiny, to be able to use these packages.
Trivia Vocaloid-P Data Packs Vol.2:
On the boxart of vol.2 the person in the red jacket is picking up a box with the Vocaloid 3 logo on it. Also on the shelves is the boxart for; Hatsune Miku Append, VY1v3, Vocaloid 3 Megpoid, Kagamine Append, Hatsune Miku Box, Mew, and Megurine Luka
(C) Vocaloid wiki