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I've been digging and I finally found an article that says it's daily low-dose aspirin. Zheesh, shouldn't be so hard to find out.
Here's the citation for the study itself:
SOURCES: Peter M. Rothwell, M.D., Ph.D., professor, neurology, University of Oxford and John Radcliffe Hospital, Oxford, U.K.; Nancy R. Cook, Sc.D., associate biostatistician, Brigham and Women's Hospital, Harvard Medical School, Boston; Eric Jacobs, Ph.D., strategic director, pharmacoepidemiology, American Cancer Society; March 21, 2012, The Lancet, March 21, 2012, The Lancet Oncology