[Ferran]

For those interested in more details, "liberty" is not exactly the same as "freedom" (as many Romance language speakers might think), but there's a subtle difference very well explained at dictionary.com:

lib·er·ty /ˈlɪbərti/ Pronunciation Key - Show Spelled Pronunciation[lib-er-tee] Pronunciation Key - Show IPA Pronunciation
–noun, plural -ties.

1. freedom from arbitrary or despotic government or control.
2. freedom from external or foreign rule; independence.
3. freedom from control, interference, obligation, restriction, hampering conditions, etc.; power or right of doing, thinking, speaking, etc., according to choice.
4. freedom from captivity, confinement, or physical restraint: The prisoner soon regained his liberty.
5. permission granted to a sailor, esp. in the navy, to go ashore.
6. freedom or right to frequent or use a place: The visitors were given the liberty of the city.
7. unwarranted or impertinent freedom in action or speech, or a form or instance of it: to take liberties.

It's also curious to note that "liberty" has little usage among Americans if we compare both words, so I wonder if there was some reason for that preference...