writes "Search the Internet for any research article published in 2011, and you have a 50–50 chance of downloading it for free. This claim — made in a report produced for the European Commission — suggests that many more research papers are openly available online than was previously thought. Previous best estimates for the proportion of papers free online run at around 30%.
Peter Suber, director of the Office for Scholarly Communication at Harvard University in Cambridge, Massachusetts, says the report confirms his optimism. “When researchers hit a paywall online, they turn to Google to search for free copies — and, increasingly, they are finding them,” he says."Link to Original Source