Yes thank you Omega, I got it ! Yet.. where does this phrase come from ? as it is presented as built-in and Ledger says << PRIVACY : Your private keys are never held or known by Ledger or a third party: they are hard locked in the Secure Element. With Ledger Nano S, your wallet remains decentralized, you are your own bank. >> (re:
https://www.ledgerwallet.com/products/ledger-nano-s ) - well! I'm glad to hear this, but must it be beleived on words ?! I can't find any description of the creation of the 'phrase' (is there a random generator inside the key ? or has it been pre-manufactured in Ledger's office before mailing it to me ?)