(12)Full coverage of equity and non-equity securities offered to the public or admitted to trading on regulated markets as defined by Council Directive 93/22/EEC of 10 May 1993 on investment services in the securities field(8), and not only securities which have been admitted to the official lists of stock exchanges, is also needed to ensure investor protection. The wide definition of securities in this Directive, which includes warrants and covered warrants and certificates, is only valid for this Directive and consequently in no way affects the various definitions of financial instruments used in national legislation for other purposes, such as taxation. Some of the securities defined in this Directive entitle the holder to acquire transferable securities or to receive a cash amount through a cash settlement determined by reference to other instruments, notably transferable securities, currencies, interest rates or yields, commodities or other indices or measures. Depositary receipts and convertible notes, e.g. securities convertible at the option of the investor, fall within the definition of non-equity securities set out in this Directive.