What do the defined acronyms stand for?

[James Frost]

Reading through the licence there are a couple terms that are defined as 
acronyms without being expanded. I would be interested in knowing what 
they mean. As these terms are not used repeatedly, I feel it would be 
best to write the full acronym out to improve the licence's readability.

The acronyms are:

NSS: My guess is Network Service Source. This is only used once, so 
really has no justification in being shortened.

CCS: Covered Code Source? Not really sure about this one. This is 
referenced three times in the licence, all in section 5, so perhaps that 
could be reworded to expand the term.