[matharmin]

Let's say I have an open-source project licensed under Apache 2. The grant allows me to include the extension in my project. But it doesn't allow me to relicense it under Apache 2 or any other compatible license. So if I include it, my project can't be Apache 2-licensed anymore.

Apache 2 is just an example here - the same would apply for practically any open source license.

The one place I imagine it could still work is if the open-source project, say a sqlite browser, includes it as an optional plugin. So the project itself stays open-source, but the grant allows using the proprietary plugin with it.

[stavros]

I don't see why this would infect your project, though. You aren't using the code directly, you're using it as a tool dependency, no? Same way as if your OSS project used an Oracle DB to store data.

[nextaccountic]

Unlike Oracle DB, sqlite gets embedded in your program binary. It's a library, not an external service, and this matters for OSS licenses