iTunes Kind tag: Protected, Purchased, Matched

Hello,

I'm trying to find a way to modify the Kind tag on iTunes files (eg: Purchased, Matched, Protected...). It seems this is the only thing that I can't edit with mp3tag. So my question is: Is it possible to edit this field with mp3tag? Also is there any other way to modify it?

Thanks!

see this thread: /t/14458/1