If I understand https://help.ubuntu.com/community/Repositories/Ubuntu correctly, both are not free and not supported by Canonical. So what is the difference between them?
Where can I get a list of the partners and their repositories? Is there an official (non wiki) documentation from Canonical on this subject?
Can multiverse software be closed source? If not, how and why can non free software be open source?
What are "licensing requirements"? An example would be great.
Closed source does not imply proprietary?
How is proprietary different from non free?
Partner software gets support from whom? Enterprises which have contracts with Canonical stating they will provide support? Is this what partners are?