Hi Hank, sorry for the wait!
Yes that’s possible with Transloadit. We run mp4box by default on any mp4 output, but even better, we will generate dash or hls chunks with minimal boilerplate using our /video/adaptive Robot (here’s a demo: https://transloadit.com/demos/video-encoding/implement-mpeg-dash/)
We don’t offer encryption yet, but I’m happy to add this to our service if you’d like to become a tester and collaborate on this with us. It would take some time, but it would also make for a service that’s a tight fit to your use case.
If you’re interested, please hop on a private support thread (http://transloadit.com/support/) and we can figure this one out together!