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As far as I was aware, permission was granted from IPB a long time ago, I'm sure there where posts regarding this a long time ago too.
I notice both:
http://www.koudanshi.net/
www.bbpixel.com
are both gone now?
the suspension for BBPixel states:
Quote:
This account has been suspended.
Please contact Billing/Support department for more information
invisionboard isn't open source though I believe?
I really don't know about all the legalities though and/or exactly what has happened, so I couldn't comment further, sorry.