TPG2017 Chapter VI paragraph 6.176

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In some circumstances, particular intangibles may contribute to the generation of cash flow in years after the legal protections have expired or the products to which they specifically relate have ceased to be marketed. This can be the case in situations where one generation of intangibles forms the base for the development of future generations of intangibles and new
products. It may well be that some portion of continuing cash flows from projected new products should properly be attributed to otherwise expired intangibles where such follow on effects exist. It should be recognised that, while some intangibles have an indeterminate useful life at the time of valuation, that fact does not imply that non-routine returns are attributable to such intangibles in perpetuity.