Where persons or things related to such persons are photographed with a mobile visual data processing device in cases falling under the subparagraphs of Article 25-2 (1) of the Act, the fact of photographing shall be indicated and informed by means of light, sound, signboard, written notice, or announcement, or other means or methods equivalent thereto so that data subjects can easily recognize such fact: Provided, That the fact of photographing may be informed by the means notified on the website established by the Protection Commission where it is difficult to inform data subjects of the fact due to the characteristics of photographing methods, such as aerial photographing using a drone.