What determines whether 'Warranty' appears in About This Mac?
Are the two spellings of 'license' and 'licence' accurate in your question? The second spelling is usually a British spelling variation, (like labour for labor, aluminium for aluminum, &amp;c.)

I would hazard a guess that the word 'Warrantee' appears because different legal conditions are in effect if this particular Mac/OS X was purchased in the UK.

My iMac, registered with AppleCare and purchased in the the US, does not have 'Warrantee.'