Intelectual property, copyright and public domain are highly complicated ( at least for non-specialists) with different laws in most countries. Now as a record collector I am specially interested in the public domain. In France recorded works enter after 50 years in the public domain. A couple of years ago I have bought some boxsets with 50 Jazz records that had just entered the public domain.
Now yesterday I bought a Miles Davis compilation, and even so I had already half of the recods it was still interesting seen the low price. Six records on a 3CD set covering 1956 & 1957, interesting period when Miles had his famous first quintet with John Coltrane, had signed already with Columbia and still owned some records to Prestige. So on the boxset you have three Prestige records Relaxin, Cookin, Steamin two Columbia records, Round About Midnight, Miles Ahead and the sixth record the great soundtrack Ascenseur pour l'echafaud by director Louis Malle recorded in Paris with French musicians for the Fontana label.
The sound is OK, slightly less brilant then the remastered Columbia CD's and without the bonus tracks.
This was actually the first time that I saw a Miles Davis Columbia record as public domain release by an unknown label. Now my question, does anyone knows how this works technically, I can't imagine that just anybody wil show up at let's say Sony/CBS and ask for the master tapes to copy. Where does the source material for public domain releases come from?