13. Is there a ban on donations from any other source?

Article 22-3, "Corporations that have received the government subsidise, assessment, subsidise for interest, and other benefits shall not contribute political funds within an year after the notification of the grant of sibsidy"

Article 22-4, "Corporations that have incurred financial deficits for over three business years shall not contribute political funds in relation to political activities until the loss is covered." (Source: Political Funds Control Act, 1948 (as amended by Act No. 135 of 2007))