Very interesting! Sadly, their code does not seem to have a license. Hopefully they will correct that soon. No one gets to opt out of laws, and the default laws don't really let you do anything.
That helps, but doesn't answer the question. This part is very helpful:
> Files we created are licensed under the Apache License, Version 2.0, viewable at http://www.apache.org/licenses/LICENSE-2.0, and are marked as such.
This part makes it useless:
> Code borrowed from other sources keeps the original copyright and license.
What are those licenses? If they used a package manager I could just see that (a nice easy list). As it is, I can't tell what rights and requirements I have.