It may actually be restricted for all I know. I wouldn't think that an IP restriction on the data set would prevent the study in question (and its conclusions) from being at least referenced. While the IP issues are interesting (minimally), the proxies being dropped are even more interesting. I suppose it's all part of strengthening the "consensus". They need to start using backhoes to bury contradictory studies - the shovels just aren't getting 'em deep enough.