You can configure Referer, IP, and User-Agent blacklists or whitelists and URL signing to authenticate and authorize visitors. You can use these features to control access to resources of Alibaba Cloud Content Delivery Network (CDN) and improve the security of your CDN service.

You can use the following features to implement access control.
Feature Description
Configure hotlink protection Allows you to configure a Referer blacklist or whitelist to authenticate and authorize visitors so that you can control access to CDN resources.
URL signing Allows you to configure URL signing to prevent unauthorized downloads and use of resources on origin servers. URL signing is more secure than Referer-based hotlink protection.
Configure remote authentication Allows you to authenticate requests that are sent to CDN nodes to prevent unauthorized downloads and use of resources on origin servers.
Configure an IP blacklist or whitelist Allows you to configure an IP address blacklist or whitelist to authenticate and authorize visitors so that you can control access to CDN resources.
Configure a User-Agent blacklist or whitelist Allows you to configure a User-Agent blacklist or whitelist to authenticate and authorize visitors so that you can control access to CDN resources.