LinkedCT

Data exposed: Linked Clinical Trials

Size of dump and data set: ~25 million triples as of April 2011. 4.8GB NTriples dump

CC by-nc-sa license

You are free to copy, distribute, transmit, and adapt the work for non-commercial purposes. However, you need to follow the terms and conditions available at http://www.clinicaltrials.gov/ct2/info/terms

According to OKD (http://www.opendefinition.org/okd/) the data is not considered open.