"Third party" software - a clear term?

[Marko Oreskovic]

Kyle Nitzsche wrote:
> Hi,
> 
> I was just reading the excellent Ubuntu doc's "Adding a Software 
> Repository" section, and I noticed that the term "third party" is used 
> to describe software repositories *other than* Ubuntu.

I think that first party is ubuntu/Company that test and controls
software deployment etc.
Second party is the user of the system.

Everything else is third party, stating that particular company
have control of and gives support to,
only that parts of the system coming from its quality control etc.