TPG2017 Chapter VI paragraph 6.175

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The projected useful life of particular intangibles is a question to be determined on the basis of all of the relevant facts and circumstances. The useful life of a particular intangible can be affected by the nature and duration of the legal protections afforded the intangible. The useful life of intangibles also may be affected by the rate of technological change in the industry, and by other factors affecting competition in the relevant economic environment. See paragraphs 6.121 and 6.122.