Eligibility criteria for proving Sephardic descent include: a certificate issued by the Federation of Jewish Communities of Spain, or the production of a certificate from the competent rabbinic authority, legally recognized in the country of habitual residence of the applicant, or other documentation which might be considered appropriate for this purpose; or by justifying one's inclusion as a Sephardic descendant, or a direct descendant of persons included in the list of protected Sephardic families in Spain referred to in the Decree-Law of 29 December 1948, or descendants of those who obtained naturalization by way of the Royal Decree of 20 December 1924; or by the combination of other factors including surnames of the applicant, spoken family language (Spanish, Ladino, Haketia), and other evidence attesting descent from Sephardic Jews and a relationship to Spain. Surnames alone, language alone, or other evidence alone will not be determinative in the granting of Spanish nationality.