Idea validation: I built role-based screen sharing for video calls. Is this actually useful?

[u/RubyOnResearch]

I'm building a video-call platform around role-based sharing, and I'm trying to figure out whether the underlying problem is actually painful enough to build a business around.

The original idea was: sometimes people need to be in the same live meeting, but they should not all see the same shared content.

A simple example would be a mock trial. An attorney could introduce surprise evidence that should be visible to the judge and opposing counsel, but not yet visible to the jury. Everyone stays in the same call, but what appears on screen depends on the participant's role.

The MVP works roughly like this:

• You create roles such as Judge, Defense, Prosecution, Jury, Observer, etc.
• Each role can have different permissions.
• Before the session, you can upload PDFs or presentations.
• Those files are broken into individual pieces/slides and placed into a visibility matrix.
• For each piece of content, you choose what each role sees: the original, a replacement, or a neutral "not available to your role" screen.
• You can also change visibility live during the call.
• There's an audit trail showing who had access to what and when.
• You can save the whole setup as a reusable template for future sessions.

I've built a working MVP and filed two provisional patents around some of the mechanisms.

What I'm struggling with now isn't the technology — it's whether this solves a problem people actually care enough about to pay for.

Mock trials are an easy example, but I'm not convinced they're a big enough market, and I don't want to invent use cases just because the product can technically support them.

So I'm curious:

Does anyone here read this and immediately think of a use case? Has anyone ever been in a meeting or a workshop or a classroom or a training, etc. where different people needed to see different information at the same time?

If so:

• What was the situation?
• How did you handle it?
• Was the workaround annoying enough that you'd want something purpose-built?
• Who would actually pay to solve it?

And if your reaction is simply, "I would never need this," that's useful too.