http://liveforlivemusic.com/news/paul-mccartney-beatles-rights-win/
The U.S. Copyright Act of 1967 ... states that for songs published before 1978, rights can be reverted back to the original author after 56 years (or for songs published in or after 1978, the song’s rights can be recaptured after 35 years).
The U.S. Copyright Act of 1967 ... states that for songs published before 1978, rights can be reverted back to the original author after 56 years (or for songs published in or after 1978, the song’s rights can be recaptured after 35 years).