Standard Practice with Music
The way that classical music's traditionally been published was to take some old edition, maybe make some minor changes to it and copyright it as new material. Its becoming more difficult to do this in recent years as scans of the original editions have been made available on-line. This only applies to pre-1920 music since the copyright changes for post-1920 make it almost impossible for material to end up in the public domain unless the composer specifically puts it there.
Putting this together with all the stuff that's been said and written about downloading is interesting. It gives more of a perspective about what's really going on. The official line is that the little guy is being cheated by downloads and stuff but in practice the little guy's being cheated, period. Material like books and music are the property of publishers and they don't like free stuff being available because it makes it more difficult for them to push their "for rent" material.