I’m not sure about the legality, but if Richard Dawkins isn’t bothered by the copyright ramifications, then neither am I.
An unauthorized PDF translation of Dawkin’s The God Delusion, by Iraqi emigrant Bassam Al-Baghdadi, who lives in Sweden, has reportedly been dowloaded ten million times,
… with 30 percent going to Saudi Arabia. Bassam said that there were over 1,000 downloads on the very first day after he uploaded it, and the numbers only climbed as the translation was picked up and shared on the blogs, websites and forums of prominent Arab atheists. The book has prompted unprecedented controversy and debate in the Arab and Islamic worlds.