exFAT is a format optimized for flash drives, allowing you to save files 32GB and up. GoPro uses exFAT for larger SD cards, but for 64GB ones and smaller, it still uses the FAT format that only save files up to 4GB in size. Microsoft has refused to give TechCrunch more info about the agreement, but in the partnership's announcement, Microsoft Technology Licensing's Nick Psyhogeos said:

This agreement with GoPro shows the incredible breadth of technology sharing enabled through patent transactions. Microsoft's licensing of personal wearable technologies is seeing strong demand as we partner with companies from all industries to optimize solutions for their customers around the globe.

Despite all the secrecy, GoPro has already benefited greatly from the deal. The action camera-maker's stock has been dropping these recent months, but it's gone up from four to six percent after the partnership was announced.