Rescission of customs exemption for imported artworks removes prior duty-free treatment for museum exhibitions, with retrospective savings. The Central Government, invoking powers under the Customs Act and the Customs Tariff Act and citing public interest, rescinds Notification No. 26/2011 Customs that exempted works of art imported for exhibition in public museums or national institutions, while preserving actions done or omitted before rescission and specifying the rescission's commencement.