Hide user id: this removes all evidence of the receiver from the encrypted file. In case the transmission is intercepted noone could gain information about the recipient from the file. If the receiver has multiple keys he needs to try which one was used.
Agochar o ID do usuario: esta opción elimina todos os vestixios do destinatario no ficheiro cifrado. No caso de que se intercepte a transmisión, ninguén poderá obter informacións sobre o destinatario a partir do ficheiro. Se este destinatario tiver varias chaves, terá de experimentar para saber a que utilizou.