Licenses are perpetual and royalty-free. Each license purchase grants you 12-month upgrade subscription.
MindFusion offers discounts for small companies, freelancers, academic institutions, returning customers and others. Read details at the discounts page.
Charting for WinForms is also part of MindFusion.WinForms Pack (prices here), which offers much greater value for your money than a single component license.
* Site - wide License: Unlimited number of developers of an enterprise at a single company branch.
** Enterprise License: Unlimited number of developers of an enterprise at all its branches world-wide.