This appears to have significant amounts of functionality that the open source pdf.js does not.

Yeah but this isn't open source. It's proprietary with source available, despite what you claim in numerous places throughout this thread. You're building a proprietary product on top of an open source project. You also chose a name that creates the impression that you built the original open source project, which you don't appear to be contributing anything back to. Comparing yourselves to Red Hat has to be a joke, right?

No, Express will be available under dual AGPL/commercial license.