Sign a PDF with your certificate (Work in progress)

The Certificate Sign feature allows users to digitally sign PDF documents using digital certificates to ensure document integrity and credibility. Users can select private key files, certificate files, and keystore files and set the display method and reason for the signature. This is useful for users who need to digitally sign PDF documents. For example, in legal documents, users may need to digitally sign contracts or agreements to ensure their legal validity; in enterprise document management, users may need to digitally sign important documents to ensure their integrity and credibility. Additionally, this feature can be used to timestamp sign PDF documents to track document modifications. By using certificate signing, users can ensure the integrity and credibility of PDF documents and easily manage and distribute them.