.netCHARTING offers two main products with a common API designed for usage in different environments. Each product is licensed independently.
1) WebForms licenses are web specific. They may be used from ASP.NET pages within IIS. A webforms version will not generate charts outside of an IIS web server. WebForms usage is for ASP.NET web sites.
2) WinForms licenses are desktop specific. They will not function within IIS. Winforms licenses would be used for desktop applications, offline generation, windows services, and for generation in a background thread.
If you have any further licensing questions, please contact orders@dotnetcharting.com