Yes, it is illegal, but you can get a program to make your own UTAUloid. You record your voice in Audacity (taping all the japanese pronounciations) although you can use english too, but i dont think it would work as well. Then you use the program. It is almost like the Vocaloid program but not as good. I would recomend to buy the program, since it is pretty awesome
mediafire
You can download IA Vocaloid songs from Nicosound. This site is basically the audio version of NicoNicoDouga. On this site you can download all of IA's songs that have been posted on NicoNicoDouga.
You can't get Vocaloid for free, but there is a programme called UTAU which is nearly the same thing; you can also make your own Vocaloids on that.
On the internet. Use 'Youtube to Mp3' converter and convert any song on youtube you like (i.e. any vocaloid song on youtube) so there you go :)
Because Vocaloid is a licensed technology, there are many products that use it. Zero-G's first generation Vocaloids (all English voice libraries) have demo versions available for download. Google the following: zero-g vocaloid trial Should be the first search hit.
mediafire
YouTube to MP4 Downloaders work (but it does depend if the song is copyrighted, 'cause if they are then downloading them with a YouTube to MP4 Downloader is illegal).
You can either Google "Vocaloid Download" or "Hatsune Miku program download" That's how I found it. But yeah, It's called Vocaloid: Project Diva.
Yes, it is possible.
You can download IA Vocaloid songs from Nicosound. This site is basically the audio version of NicoNicoDouga. On this site you can download all of IA's songs that have been posted on NicoNicoDouga.
From the internet (I don't suggest this) or buy it in Japan
You have to buy it to have an activation number.
I believe so. If a vocaloid song is fanmade, then i think so. A vocaloid singing a previously-copywrited song, though... I'm not sure, it's probably illegal.
on thiefy.com buy vocaloid and don't steal
You install a Vocaloid like any other piece of software. Price varies depending on the Vocaloid but can be as much as $200. You have to pay for Vocaloid, unless you illegally download it. However there is a program called UTAU that is similar to vocaloid and lets you create your own UTAUloid rather then just the one voice
You can't get Vocaloid for free, but there is a programme called UTAU which is nearly the same thing; you can also make your own Vocaloids on that.
On the internet. Use 'Youtube to Mp3' converter and convert any song on youtube you like (i.e. any vocaloid song on youtube) so there you go :)