Справочник Пользователя для Canon 3035

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Glossary
4-10
4
Appendix
User signature
Adds a digital signature to a private document, based on the registered user 
information when logging on using a login service. This prevents unauthorized access 
and alterations to the signed document.
X
X.509 (DER)
X.509 is a standard for digital key certificates defined by the ITU (International 
Telecommunications Union). DER (Distinguished Encoding Rules) is a binary 
encoding format for digital key data.