(a) I've used it for academic research (b) Does not seem to exclude use in an open source application or freeware. (c) They tell you to e-mail them if you want

(a) I've used it for academic research (b) Does not seem to exclude use in an open source application or freeware. (c) They tell you to e-mail them if you want to use it commercially. They have a documented API you can play with, then if you want to make a commercial product, you can pay them and use the same api that you are already familiar with and understand the capabilities of.