Copyright (patents/intellectual property) is one of Benjamin Tucker's Four Great Monopolies[1] that give rise to monopoly capitalism[2]
[1] http://en.wikipedia.org/wiki/Benjamin_Tucker#The_Four_Monopo...
[1] http://en.wikipedia.org/wiki/Benjamin_Tucker#The_Four_Monopo...
copyright is protection of intellectual property, and securing property rights is the prime reason for goverment to exist.
according to the second position (and taking opposition to the estate/death tax into account) it seems consistent with a libertarian position to argue for infinite copyright terms.
am i wrong? i am not a libertarian, but i try to understand you folks.
In general though, I think the modern consensus in Libertarian circles has fallen on the side of opposing or greatly limiting IP in general. See http://wiki.mises.org/wiki/Intellectual_property for a reasonable overview.