Bintray Premium offers enhanced features such as private repositories, permission management, and the ability to create signed, expirable URLs for accessing repository content. These signed URLs are unique, potentially limited in lifetime, and offer secure access to private artifacts by encrypting the URL with internal, private, and public keys associated with a user's Bintray account. This functionality allows both Bintray and non-Bintray users to download packages via one-time unique URLs, which can be revoked at any time. Users can customize the URL's expiry time using a simple JSON configuration, and the feature is designed to automate and simplify the distribution of secure download links.