The choice to pick up Utau instead of Vocaloid is interesting. Usually the open source version has a halo around it, but in this case the commercial version is

The choice to pick up Utau instead of Vocaloid is interesting. Usually the open source version has a halo around it, but in this case the commercial version is gowing forward fast enough, there's efforts to have the technology on about every platform they feel they can break even, and overall the software has very permitive licensing concerning the end product (the songs), so there isn't much legal friction surrounding the product's licensing right now. What's also intersting: the image characters of the vocaloid packages are under a CC license and can be used freely for non commercial work, and quite easily for commercial work as well as it seems. The availability of the character and all the community surrounding is often cited by the son makers as a major attract to show their work to a larger public, and not have to take too much time on the image, "marketing" side of it.