I am certainly not a lawyer, but I'm thinking those requirements for links are based/intended for web pages where each page is it's own "legal entity" separate from the rest of the domain. An ePub is a complete product - a complete entity - of it's own. The copyright page is valid no matter where it is placed - front or back - of the book because it is a single entity. Likewise I would thing that attributions are ok as long as it is somewhere within that entity.
Maybe someone else can provide a better answer??
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