License info is not mentioned about Wi-Fi driver(*.ko) files.?What kind of license is wifi driver(https://github.com/MediaTek-Labs/linkit-smart-7688-feed/tree/master/mtk-sdk-wifi)? Is it GPL or should we take permission before using in our project?
No, it comes with the same license as you download the SDK and firmware source code. No need of permission for using.