Struct Signature 

pub struct Signature {
    pub signer_name: String,
    pub date: String,
    pub is_valid: bool,
}

A digital signature widget found in the document. Returned by Document::signatures; cryptographic verification is performed separately by Document::verify_signatures.

Fields

signer_name: String

Display name from the signature dictionary’s /Name entry, or from the certificate’s subject if /Name is absent.

date: String

Signing time as a PDF date string. May be the signer’s local time (untrusted) or a TSA timestamp (trusted) depending on the PAdES profile.

is_valid: bool

true if the signature digest matches and the certificate chain validates. For full validation reports, see Document::verify_signatures.