The RNA-seq data sets presented here from NAM parents are provided by the Schnable lab at Iowa State. While researchers should feel free to use these data for investigations of individual genes, it is asked that they refrain from genome- or transcriptome-wide analyses of this dataset until Schnable lab has published on it, so the people responsible can get proper credit for their hard work. Think of it like the Fort Lauderdale Agreement only for expression data.
For more information, contact them.
For more information on the NAM parental lines themselves, see the Buckler lab's website