+= Is it legal to use Hachoir? =
+Answer: I don't know :-) May depend on your country.
+I think that reverse engineering may be illegal, but most file formats are standard and well known. It's not forbidden to display a PNG picture for example.
+ * (fr) [[http://www.legifrance.gouv.fr/WAspad/UnArticleDeCode?commun=CPROIN&art=L122-6-1|Law text of intellectual property, article L122-6-1]] (about reverse engineering)
+ ** In french: Code de la propriété intellectuelle (partie législative), article L122-6-1, concerne la rétro-ingénierie.