Satyr is licensed under the Academic Free License because I want you to be able to use the code if you choose to. But, and this is important, you won't have to change the code to customize Satyr. If I do my job right you'll be able to add functionality and data to Satyr using a combination of simple configuration changes, dynamic code compilation, and compiled add-ins. I'll have more to say about extensibility in the future so stay tuned.