Hey all, I have a quick update for people watching this thread.
In AUI 8, the AUI repo was split in to multiple discrete packages, and the core AUI components are re-licensed under an Apache-2.0 license once more. Head to AUI 8.0 is released! for more details.
AUI 7.x will remain licensed under the Atlassian Developer Terms.
Cheers,
Daz