Forum Hosting

Would it be legal for me to create a system that people can signup on my website and it will automaticly create forums for them using your script?  I may have ads on their pages but i would not charge them for the basics.  For upgrades with mods and stuff i would but that is a "service charge" or for them to go "Ad Free" it would cost money.  Can i do that with your script if i left a copyright line to you on the bottom?

(the forums will be hosted on my web server)

Great script :-)

Thanks,
Tyler