A revision of the Japan copyright law went into effect Dec. 30 after the bill was passed through the country's National Diet (legislature) on June 29, 2018. It extended the copyright protection period from 50 years to 70 years after the author's death.
The extension was first discussed as part of the Trans-Pacific Partnership (TPP), which seemed dead after U.S. President Donald Trump withdrew his country from the negotiations. But the remaining 11 countries, which include Japan, have moved forward with the TPP, including the copyright protection change.
The revised copyright law in Japan was timed to coincide the TPP going into effect, but the law is not conditional on the trade partnership.