In a lot of countries it's life plus 70 years. If it was only 70 years, we'd already have everything from 1951 and earlier. However, we have to wait for the aut

In a lot of countries it's life plus 70 years. If it was only 70 years, we'd already have everything from 1951 and earlier. However, we have to wait for the authors to die before we even start counting, and good luck if it's somebody obscure and you can't find their date of death.