Hi folks, I am totally new here on GBATemp, but I thought, why not start with something for you. I know there is DiscU.exe and VGMToolbox to decrypt Wii U Disc images (.wud) if you have the disc key and the common key, but I usually sit in front of my Macbook and both applications only work on Windows (VGMToolbox didn't compile or run with Mono and DiscU.exe isn't a C# application anyway, so both of them didn't work). That's why I decided to just code my own WUD decryption tool. And because I am a friend of OSS and most probably a soon-to-come Free Software Foundation member, it was clear that I have to release the source code. It's for sure not the best work and the code has to be optimized and cleaned, there's almost NO documentation about the code itself right now, but you can view it on Github here: https://github.com/maki-chan/wudecrypt The README file should tell you everything you need to know, but if there are any questions, I'll try to answer them in here. Have fun decrypting WUD images on Windows, OSX and Linux EDIT: Added Linux and OSX binary. Windows will be uploaded by tomorrow, just too tired now and only wanted to push something out before I go to bed. EDIT2: Added Windows build, though it's untested right now. Would be nice if somebody could give me feedback about the builds EDIT3: Fixed some (non-critical) code defects including 3 minor memory leaks, pushing WUDecrypt to v0.1.1.