A CSD register (Swedish: avstämningsregister) is the register kept by a central securities depository, in Sweden Euroclear Sweden, which serves as the share ledger in a CSD-registered company. The shares are then held in book-entry form, and ownership is shown in securities accounts (VP accounts) instead of by share certificates.
The vast majority of Swedish limited companies are not CSD-registered. They are non-CSD companies (kupongbolag) and keep their own share ledger. NVR's digital share ledger is designed for these companies, not for CSD-registered companies.

A CSD-registered company is a limited company whose share ledger is kept by a central securities depository.
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A central securities depository (CSD) keeps the records of securities and owners in CSD-registered companies.
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A non-CSD company (kupongbolag) is a limited company not registered with a CSD, like most Swedish companies.
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A share ledger is a record of a company's shares and who its shareholders are.
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