MPP (Microsoft Pen Protocol) is pen tech invented by Microsoft. We believe this is also very similar to AES.
Originally Microsoft used a tech called N-TRIG in their Microsoft Surface devices, but switched to MPP.
It is still used in many Microsoft Surface devices and a few other mobile products.
Microsoft Surface Pen - https://en.wikipedia.org/wiki/Surface_Pen
r/stylus - About MPP and AES 2022/08/22