You're both right - the text dates form the original 'Carmina Burana', but Carl Orff composed this setting (which makes it not in public domain).
Jane April 10, 2011-3:46
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Don't be stupid. 'In trutina' comes from 'Carmina Burana' which was written between the 11th and 13th centuries so is in the public domain. You cannot claim copyright on them.
You're both right - the text dates form the original 'Carmina Burana', but Carl Orff composed this setting (which makes it not in public domain).