I am not a lawyer but, if I was constructing a case around HLG, I would take this approach: The fact that 2017 TVs can now support the relevant standards for non-broadcast services means that it is technically possible for Samsung/BBC to achieve this on their software/hardware platform. Therefore, the failure to apply this technique to pre-2017 models is either because a) there is a technical limitation present in older models that does not apply to the 2017 range or b) no such limitation exists but Samsung have made a commercial decision not to apply this technque to older sets. Whichever is the case then Samsung would have to show that they specifically excluded support for relevant non-broadcast service standards when describing the capabilities of pre-2017 models. I would check all claims made at the time for any small print about limitation of support for the relevant standards. Otherwise, it would seem reasonable for purchasers to assume that all such content would be supported. If someone says "standard X" is supported then that inlcudes all subtypes of "standard X" unless specifically excluded. If a) is the case, then the only redress would be a physical add-on or replacement TV. If b) then whatever software changes have been applied to 2017 TVs should be applied to older sets. I repeat, I am not a lawyer, but it seems to me that a case could be constructed along these lines.
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