Bank secrecy (or bank privacy) is a legal principle in some jurisdictions under which banks are not allowed to provide to authorities personal and account information about their customers unless certain conditions apply (for example, a criminal complaint has been filed). In some cases, additional privacy is provided to beneficial owners through the use of numbered bank accounts or otherwise. Bank secrecy is prevalent in certain countries such as Switzerland, Singapore, Luxembourg and the Philippines, as well as offshore banks and other tax havens under voluntary or statutory privacy provisions.