Yes, this aspect of copyright law has changed since the Sixties. The circled-C symbol (or the equivalent words) were required before 1989: http://en.wikipedia

Yes, this aspect of copyright law has changed since the Sixties. The circled-C symbol (or the equivalent words) were required before 1989: http://en.wikipedia.org/wiki/United_States_copyright_law#Copyright_notices http://en.wikipedia.org/wiki/United_States_copyright_law#Cop...