Take care if you travel to the United States. It was a long story but finally authorities have now the right to analyze data contained on hard drives! The US Court of Appeal confirmed their rights to check the files stored on incoming notebooks!
Source: http://www.reseaux-telecoms.net/actualites/lire-les-douaniers-americains-ont-bien-le-droit\
-de-copier-les-disques-durs-des-visiteurs-18062.html (French link)