What's strange is how it's impossible to find licensing information about the Microsoft Charting Control library that they got off Dundas. By distributing it gratis they're costing Dundas lots in lost-sales (since their cheapest license is about $699) yet no distribution of the library comes with a license agreement statement. The library installer only comes with a single-paragraph boilerplate that just says that if you don't already have a license then you can't install it.
I ask because I made some modifications to the library (which I assume would be covered under the legal protection that reverse-engineering for interopability has) but I want to know what my rights are w.r.t. redistribution.