ANSWER
A. 50 years later of copyright holders’ death
Other storage period is as follows：
The real copyright holers’ name works |
After dying; 50 years. |
Anonymous or pseudonymous works |
After it’s released, 50 years. |
Cinematographic works |
After it’s released, 70 years. |
Bits Of Knowledge
After dying; 100 years. |
Mexico |
After dying; 60 years. |
India |
After dying; 70 years. |
United States・EU member state
Korea |
After dying; 80 years. |
Colombia |
After dying; 30 years. |
Iran |
As the work is used in all the countries of the world.