# Obtaining a Certificate

To use a signature function which is based on Digital Certificate, you must obtain the personal certificate of a user, an intermediate certificate from the Certification Authority, and a root certificate. To use a security function based on Digital Certificate, you must obtain the certificate of the party you want to send the protected DocuWorks document to, an intermediate certificate for it, and the root certificate.
In order to use the obtained certificate, place the certificate in the Windows Certificate Store by using Certificate Manager. When using an IC card, you need an IC card reader and its driver software for Windows.