Nothing in this Chapter:
(a) affects a condition in a contract that prohibits a person from selling products other than those of a particular person; or
(b) validates a contract that would otherwise be invalid; or
(c) affects a right to terminate a contract, or to terminate a condition of a contract, being a condition exercisable independently of this section; or
(d) affects a condition in a contract for the lease of, or a licence to exploit, a patented product, that reserves to the lessor or licensor the right to supply new parts of the patented product that are required to put or keep it in repair.