Shell under PowerPoint?

Question

PowerPoint

Teachers are engaged with students online using presentations collected in Power Point. Presentations without scripts, movements on a trigger (mouse click).
It is necessary to protect presentations from downloading for home use by students + add the ability to block accounts (when the payment for the month is over).
Perhaps some kind of shell for PowerPoint with personal logins and passwords for Windows will do.

How could this be done technically? Are there any services or methods that will help to implement this?

Thanks in advance.

Answer 1

Online classes involve the teacher showing his screen to the students. So let him show the presentation as a picture from his screen, and not fumble it as a pptx file for free access for students.