"The concept of “implied limitations” under Article 3 of Protocol No. 1 is of major importance for the determination of the relevance of the aims pursued by restrictions on the rights guaranteed by this provision (see Mathieu-Mohin and Clerfayt, cited above, § 52; and Sitaropoulos and Giakoumopoulos, cited above, § 64). Given that Article 3 of Protocol No. 1 is not limited by a specific list of “legitimate aims”, the Contracting States can justify a restriction by reference to any aim which is compatible with the principle of the rule of law and with the general objectives of the Convention (see Ždanoka v. Latvia [GC], no. 58278/00, § 115, ECHR 2006-IV; and Sitaropoulos and Giakoumopoulos, cited above, § 64). "