But the current interpretation is that you cannot claim authorship over things that were already in the public domain. Feel free to read the case notes and follow some of the links in there for more info. Am I not interpreting the court rulings correctly?

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Considering de novo the evidence before the district court, we hold that the district court did not err in granting summary judgment. Johannsongs failed to offer admissible evidence to rebut Ferrara's analysis, so there is no genuine dispute of material fact as to his conclusions that Söknuður and You Raise Me Up are not substantially similar and most of their similarities are attributable to prior art. Based on these conclusions, Johannsongs has failed to satisfy the extrinsic test and Defendants are entitled to judgment as a matter of law.