License of PowerPoint slides

[mveteanu]

First of all congrats on this wonderful course!

I see that this repo is under CC-BY-4.0 and MIT licenses.

What about the PowerPoint slides located on OneDrive but referred/used by this repo in Unit1 to Unit9?
https://1drv.ms/u/s!AqsgsTyHBmRBjzAXAYw4u_WbPz4M?e=4YVchB

Are these PowerPoint slides also under CC-BY-4.0?

Thanks!