(3) The government then helped us immensely by simply confirming what we had said: under their theory of the case, there was no constitutional limit on Congress's power to extend terms; it was always a matter of Congress's discretion. Congress could perpetually extend existing terms; it could even extend a copyright to works within the public domain.

The Court clearly did not like this answer. They had bought the idea that the Constitution intended there to be a limit; the government's interpretation meant that this was a limit that was solely a matter of legislative grace. (Compare: "Under our written Constitution the limitation of congressional authority is not solely a matter of legislative grace.") They were not comfortable with the idea that they would simply say that though the constitution expressly limits Congress's power, it is Congress that gets to say what that limit is.

(4) This gave me the opening I wanted in the rebuttal to say: On the government's view, the Copyright Clause means Congress has total discretion; but that is plainly inconsistent with 125 years of Supreme Court authority. The very first time the Supreme Court ever struck down a law of Congress because it exceeded a particular grant of power in Article I, sec. 8, was in 1879 in a Copyright Clause Case. Since that time, the Court has repeatedly and unanimously imposed limits on Congress's power in the name of Copyright Clause. All of those limits so far have been implied limits. The Court has held that of all the "authors" and "writings" that might be granted copyright, only those that are "original" are allowed copyright; and it has held that of all the inventions or writings that can get patent or copyright protection, only works that are not in the public domain can get the benefit of the copyright and patent clause protection. Both of these limits are implied. Yet here, with the only express limit on Congress's Copyright Clause power, the government was arguing that in effect, the limit was limitless. This, I argued, is fundamentally inconsistent with this 125 year history, and shows the government must be wrong in its view.

(5) Finally, the government's repeated invocation of the "delicate balance" that Congress has struck became too much to ignore by the end. My final point before the Court is ultimately the most compelling politically, though not directly relevant to the constitutional argument: Under the current term of 95 years, under the most conservative assumptions about royalty income and interest rates, the current term gives authors 99.8% of the value of a perpetual term. Put differently, the current "delicate balance" between author and the public is 99.8% to the author, .2% to the public. (Check out footnote 6, page 6 of the economists' brief if you want to do the numbers.)

after thoughts and advice on interpretation (read: clues on the game)

Lots of people have made tons of noise about what the court asked questions about and what it did not ask questions about. In my experience, this is not an indicator of anything. One hour is an extraordinarily small amount of time to consider the issues in this case. They ask question about things that need to be discussed. They let go things that they get from the briefs. When I clerked, oral argument was irrelevant to 90% of the cases; that is because they do their work based on the writing, and unlike most branches of government, they actually do their work.