I have a page (gallery) HERE, which contains a few MP4 videos, and their respective associated preview images.
The videos are hidden, and for each of the preview images, their links point to their respective videos:

...you can't see it in the screenshot, but the MP4 filenames are at the end of the blue link.
Now, somewhere on one of my X3 sites, for 2 or 3 videos (not videos using <video>), I discovered that I could add ?autoplay=1 after the filename to have it automatically start playing (I can't remember where I used that trick, or in what situation.
Back to this gallery, I have downloading disabled on all my X3 sites, and my question here in this post is, am I able to prevent downloading of the videos in this gallery somehow, perhaps using something similar to the ?autoplay=1 trick?
Currently there are 2 ways that users can download these videos: 1.) by selecting Download using the 3 vertical-dots in the lower-right corner of playing videos, and 2.) by right-clicking on the playing video itself.
When embedding videos using <video>, I know that I can use controlsList="nodownload" to disable the Download option to be displayed with the 3 vertical-dots. Is there a Custom CSS that I can add to this gallery to prevent the Download option being displayed with the 3 vertical-dots?
As for the users right-clicking the videos when they are open, the download (Save video as...) option in this case is controlled by the browser, so I would imagine that there is no way that I can prevent downloading by right-clicking, but I've visisted some sites over the years that prevented me from right-clicking on pages/images/videos altogether, so just wondering if X3 can prevent that too. No big deal if it's not possible, or too difficult to prevent.
Thanks in advance & have a great day.
Regards,
John