vivaldi85 wrote:
Does that mean if one simply scans that same document, from say Bach, but without the logo it would be considered public domain? In other words, would simply covering up the trademarks in the scanned version make it public domain?
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What are you looking for when re-checking the scanned scores?
Logos are not the main concern - the appear only seldom on the music print. The music that is presented to you when you buy a publication, is never the same as the manuscript of the composer or the first edition. People called editors make interpretations of the originals, and make editorial additions, which can contain dynamics, fingerings, slurring, et cetera. In some cases they make complete transcriptions. It is on these additions that copyright is claimed.
This way, a score by Bach fingered by a living editor is copyrighted for the life +50 or 70 years after the death of the editor.
So what we're looking for is: publication date, editor, and extent of editorial additions.