He seems to be talking about the delivery vehicle: the files.
And I suspect what he means is that libraries should be able to take those files out of whatever lending service they use (*cough*Overdrive*cough*) and move them to another service, even one they build and operate themselves.
This is a question that has been open for a while now because of the recent overdrive price increases that have prompted some libraries to look to 3M or other solutions.
In practical terms, what RH is saying is that just because a library bought their ebooks through overdrive they are not necessarily stuck with Overdrive forever. *They* have no problem with a library demanding their collection and taking it elsewhere.
Now Overdrive and *their* contracts...