You can use an eBook license to embed the font in an electronic publication such as an eBook, eMagazine or eNewspaper, for example.
If the font will be used as a static image, such as the cover of an eBook, then you would need a Desktop license instead.
An eBook license is based on the number of publications in which the font is used.
Each issue of a magazine, newspaper or other periodical 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 don't need a new license; otherwise, each new version that is released counts as a separate publication.