Hacker News new | ask | show | jobs
by callingbull 564 days ago
> Copyright, at least in the U.S., is automatic.

It is now, but back then a work was public domain if released without a valid copyright notice.

Charade, a 1963 film, entered the public domain immediately on release.

https://en.wikipedia.org/wiki/Charade_(1963_film)#Public-dom...