OMF, AES31, OpenTL on eLicenser

In my eLicenser Control Center, along with Nuendo 5.5 and NEK 5.5 I see:

OMF
AES31
OpenTL

Never noticed them before. Can someone tell me what they are, and do I need them?

I considering switching to Cubase and reselling my copy of Nuendo - if I do that, should I include these licenses?

Tey are all project intercahnge formats, used for transferring from one DAW to another.
They vary in what they can translate and how well they do it.
See these references for more info:
http://en.wikipedia.org/wiki/Open_Media_Framework_Interchange
http://en.wikiaudio.org/Open_TL
http://www.aes.org/publications/standards/search.cfm?docID=53