Is there a way to encrypt or password-protect part of a video?

Updating the situation:

I'd like to do the following: for the first 15 minutes, I want to play the video normally and then either not show the rest or display a frozen image instead.

I occasionally encounter corrupted videos that only show certain parts and not the entire content.

I was wondering if I could replicate such a situation based on my selection. However, I would also like the option to view the entire video normally if I choose to do so through an alternative method