But there has to be a limit, as you acknowledge. Perpetual copyright is not permitted. Who is the judge of -- within that line? Who is the judge of when it becomes unlimited? Is there, in other words, judicial review and, if there is, what standard would this Court apply to determine whether something short of perpetual is still unlimited?
If there was judicial review, the courts would apply a standard. 
It's neither because it's never stated that the courts would actually use a standard, in fact we don't even know what the standard is if any and that's what he's asking. The system is barely fooled by this, it guessed neither at 42.64%. I think it's fooled because it partially thinks the wording in the context example is definitely happening, when it's not guaranteed to happen in reality. 
( z1 apply :ARG0 ( z2 court ) :ARG1 ( z3 standard ) :condition ( z4 review :ARG0 ( z5 judiciary ) ) )