A recent New York Times article addresses a law against editing material from countries under trade embargoes – effectively banning scholarly publications originating in those areas.
Some quotes: "They can print anything as is. But they can't correct typos?" (from an EFF lawyer); "This means that the publication of the PEN Anthology of Contemporary Persian Literature ... would constitute aiding and abetting the enemy." (from a frustrated translation committee chair); "I also don't understand why it's not in our interest to get information into Iran." (from Representative Howard Berman [Cal-D]). IEEE Spectrum had a piece on the sanctions last October.