You can use an Electronic Doc license to embed the font in an electronic publication such as an eBook, eMagazine, eNewspaper, or interactive PDF.
An Electronic Doc license is based on the number of publications in which the font is used. Each issue counts as a separate publication. Regional or format variations don't count as separate publications.
Updated versions of publications that are free to previous customers do not need a new license; otherwise, each new version that is released counts as a separate publication.
For font usage in graphic images shown as the ePub cover, consider a Desktop license instead as most allow for it.