"validate the presence of the Provider Certificate"

[murata2makoto]

This phrase in 5.5.1 is confusing. Does this make sure that the provider certificate exists? The following sentence appears to check the validity of the Provider Certificate.

[llemeurfr]

Proposal for 5.5.1, re-ordered, reflecting the actual implementation:

1. The Reading System must check the signature of the Provider Certificate using the Root Certificate it embeds.

2. If a network connection is available, it must periodically update its Certificate Revocation List, as defined in [X509].

3. It must check that the Certificate was not revoked, as defined in [X509].

4. It must check that the Certificate was not expired when the License Document was last updated.

[danielweck]

Linky: https://readium.org/lcp-specs/readium-lcp-specification#55-validating-the-certificate-and-signature

[thkim2015]

Above the link is not accessible anymore.
See: https://github.com/readium/lcp-specs/blob/master/releases/lcp/latest.md#551-validating-the-certificate