The blog post is a bit outdated, but they have good info on the Telerik website about this.
What free / open source is available on the CodePlex website . As mentioned on the CodePlex page, this is a structure that may be useful to you ...
Telerik Extensions for ASP.NET MVC is a lightweight frame that helps you create rich user interfaces for ASP.NET MVC while enjoying excellent developer productivity.
Telerik has additional information posted on this to clarify the issue.
http://www.telerik.com/purchase/faqs/aspnet-mvc.aspx From your help FAQ Page:
How do you license Telerik extensions for an ASP.NET MVC product? We offer two licensing options for Telerik Extensions for ASP.NET MVC.
Telerik Extensions for ASP.NET MVC Open Source GPL (Open Source License) This is a suitable option if you are creating an application for internal use or open source with a license compatible with the GNU GPL v2.0.
Telerik Extensions for ASP.NET MVC Commercial License (Developer License with Subscription and Priority Support) This is a good option if you are building a closed source commercial product for redistribution, or if you want to avoid open source integration into your expression. This license is provided per developer, so you need to purchase the appropriate number of seat developers with Telerik.
Since you are developing an internal application, you seem to be fine.
klabranche
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