One important legacy of this brief period of activity was the "Sofia Principle", adopted at the August 1949 Comecon council session in Bulgaria. This radically weakened intellectual property rights, making each country's technologies available to the others for a nominal charge that did little more than cover the cost of documentation. This, naturally, benefited the less industrialized Comecon countries, and especially the technologically lagging Soviet Union, at the expense of East Germany and Czechoslovakia and, to a lesser extent, Hungary and Poland. (This principle would weaken after 1968, as it became clear that it discouraged new research—and as the Soviet Union itself began to have more marketable technologies.)