The Data in Motion APIs are provided by the Krikkit project under the Eclipse foundation.
The homepage for the Krikkit project is located here https://eclipse.org/krikkit/
Krikkit offers a C and Java library for application that want to communicate with Data in Motion instances.
So, I explored some more and have a few questions.
1) You have the right link. Im afraid you cannot download without a valid login to this portal.
Once you obtain your login you may want to use this image. It is more recent - Cisco Systems
2) DMo is a core IOx service. You can run your application simultaneously. Please note that the application packaging mechanism for 819 is different form the CGR.
You will have to download the c819 SDK and follow the instructions. The corresponding discussion forum is also a good source of information.
In the URL below, there is a link for Downloads pointing to a .ova file, named 'DMO Release 36 102cc3.ova'. The download steps does not mention anything about license. (I haven't been able to download it though - maybe, due to its size.) How is this different from the link I mentioned above?
The Eclipse Foundation API for Data in Motion can be found under the Krikkit project located at https://eclipse.org/krikkit/ (Note: A google search for Krikkit will take you to a proposal page and not the actual project.)