Abstract
Of fundamental importance for the understanding of the weight and significance of protecting classified information on the capital market is the deposit and settlement system for trading in dematerialized financial instruments, and in its framework – the institution of the securities account. The securities account constitutes a device identifying the person entitled under the security, which in accordance with the Securities Trading Act does not have a form of a document, and therefore its legal existence is certified by an appropriate entry in the securities account. The securities account is always maintained for a designated entity and in this respect all data identifying both the entity entitled under the account and the securities (financial instruments) entered therein are subject to special protection by the law.