It is Right of First Refusal. It means Disney has the right to buy the resale back instead of letting it go to the potential buyer (at the price the buyer offered). Someone else will probably explain it better!
It's written into the contract to protect members from having the worth of their memberships go down by people selling low. Also helps DVC sell at their rate. For example, if people were able to buy resales at $60 per point, lots would do that rather than buy direct from DVC at $84. So DVC does not allow low offers to go through, they buy it themselves at the low rate, then they can resell at their rate. Right now it looks like from posts on this board that DVC is buying back contracts lower than $70-$72.
I don't think the ROFR is to protect members as much as it is to protect new DVC sales. If the resale market dropped too low, DVD would have a very difficult time selling new points at new resorts.
Probably not as big of a deal for BCV given all it's built-in demand and tieing SAB to membership there....
...but very critical when trying to sell SSR. IMHO, that's why we've seen the sudden interest by Disney in the ROFR in the past few months. Trying to protect the market for SSR.