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According to EFF, the initial copyright term was triggered when Guthrie sold his first versions of the song as sheet music in 1945. The copyright on the song then ran out when Ludlow failed to renew its registration in 1973. Ludlow believes its copyright -- initially filed in 1956 and renewed in 1984 -- remains valid and disputes EFF's claims.

The idea of copyright law is that, after a time, every work comes back into the hands of the public, where it can be reused, recycled, made part of new creativity without having to pay a fee or call in the lawyers. That's a great thing, the real genius of copyright.

JibJab dismissed its suit against Ludlow today. As part of the settlement of the case, JibJab will remain free to continue distributing the "This Land" animation without further interference from Ludlow.