Premise: General Olson has been perfectly clear in setting out the structure of the Government's argument. It is that there is no effective limit on Congress's power under the Copyright Clause. Now, were this the first time this Court had considered Congress's copyright authority, that might be a plausible argument, but the very first time this Court ever struck down a law of Congress as exceeding Article I, section 8 power was in the context of the Copyright Clause.
Hypothesis: there is a limit on congress's power when it comes to the copyright clause