How to set data-copyright attribute?

Can you provide some information about how to set the optional data-copyright attribute?

Where exactly in Joomla do I have to set those kinds of metadatas?

Hi
according to the infos here
www.joomlack.fr/extensions-joomla/easy-image-caption-ck

you can add the tag data-copyright on the image

data-copyright="Image by Bessy (pixabay.com)"

you must set it in your editor, in html mode (I don't think that you can do it with any interface in the editor)

CEd

You can configure the plugin to take caption and copyright from other tags, like "Alt" for caption and "Title" for copyright. Not super pretty, but then you avoid fiddling with the html editor.