premise: But for them, they get the benefit of the longer term if you don't apply it to an existing copyright. I mean, if you say you need 70 years because of changes in the economy to encourage works, you grant 70 for the future, but why does that, making that apply to somebody provided him?
hypothesis: The amount of years mentioned in the text is higher than 75.
reason: It's definitely incorrect because 70 years is mentioned, and 70 years is not higher than 75 years. I'm not really sure why this was difficult.