These marks are non-registrable according to Japan’s trademark laws: 

• Marks that are against the principles of morality or signs that oppose public policy
• Generic words or marks with common meaning
• Marks that consist of flags, emblems and names of states, regions, nations and international organizations
• Marks that are lacking in acquired distinctiveness
• Marks that are primarily used as a surname
• Marks that are primarily used as a name of a geographical location
• Marks that use a signature, portrait or name of a person without authorization