Hi,
1) Yes, Vienna Key and eLicenser is the same. Vienna Key has a different package, but the dongle is exact the same.
3) Yes, you don't need Kontakt. All VSL products use VSL player (Vienna Instruments (Pro) for the VI series, Synchron Player for the Synchron series, Synchron Piano Player for the pianos, the plugins provided in different formats, all are available as VST2, and most also as VST3 as well as some other formats).
Best, Ben
Ben@VSL | IT & Product Specialist