One of the recent security changes is to recommend https for remote resources (audio/video/fonts). Epubcheck should warn if http is used. See https://github.com/w3c/epub-specs/issues/2263
One of the recent security changes is to recommend https for remote resources (audio/video/fonts). Epubcheck should warn if http is used.
See w3c/epub-specs#2263