aplumb: I agree. I think it began as a Linux-head project--the guys who are notoriously anti-commercial, which is why it is free. The name could be a problem for a commerdial product, but I'm not sure it will be if there is no money being made for which to sue. But as you mentioned, I'm not a lawyer. Thanks for the comment.
TanjB: Sirius will be available for download tomorrow after the paper is presented and needs to be installed on a Unix-based server. Demos will be available at the conference, but its in Istanbul, Turkey.
While it's great to see more open source options like this, I *really* wish they had chosen a different/unique name. Inspired by Siri(us) perhaps, but not derived from it. Knowing how litigious Apple can get protecting its iStuff trademarks and associated IP, I would think thrice before incorporating a project called Sirius into a commercial product.
Insert 'I Am Not A Lawyer' Disclaimer Here, but I am a member of the Open Source Hardware Association because I care about this sort of thing. :-)
You can ask those commercial systems what the natural diet of a cat is (using voice) and get good answers. Claiming they don't is a red flag for hype.
There is a big step from using a known cat picture and asking a question well suited for Wikipedia when using WP as the database, versus recognising a cat in a freely taken picture and asking about it in a supermarket when connected to an agent like Cortana which has access to thousands of times more sources than just WP.
It is good to see this stuff being taught and algorithms in the public domain. It is also good to see academia getting into the swim of understanding what cloud computing involves on the hardware side (although you can go to Open Compute and learn a lot more).
There is a lot more to scaling this up to beat the commercial systems. It involves some hard work and very subtle challenges due to scale, ambiguities, context, and intent. Nice work which can stand on its own merits, a shame they feel they need to claim they are giant killers when they are still ankle biters.