It has been a while since I looked last, but they have said on their site repeatedly that they are not giving out new licenses. I think I read that they are trying to not dilute the sales for their current customers.
These days, it is very hard to obtain a ventrilo license. You can apply for one on their website (ventrilo.com - there is an e-mail listed somewhere).
You may just be better off purchasing a ventrilo reseller package from a company that already has a license
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