Local rights issues, let alone international rights issues, could be the subject of their own journal article(s). However, classifying the different types of rights issues are worth mentioning:
1.
Who owns the rights to publish the e-book version if silent in original book contract?
a.
Publisher versus literary agent/author
2.
Who owns the e-book rights in any specific territory?
a.
Intra-publisher (regional offices of global publisher)
b.
Publisher versus publisher (3rd parties)
c.
Exclusive or non-exclusive Open Market rights ownership