Overview

Live provides referer validation, URL validation, and ACL to identify and filter out malicious visitors. Only visitors that meet the rules can use Live.

URL validation protects live resources from unauthorized download and theft. Referer validation uses referer blacklists/whitelists to prevent hotlinking. However, because the referer content can be forged, referer validation cannot well protect live resources. Therefore, you are advised to use URL validation. Table 1 shows the authentication mechanism of the Live service.

**Table 1** Authentication mechanism
Function	Description	Configuration
Referer validation	You can configure the referer blacklist and whitelist to identify and filter out malicious visitors.	For details, see Referer Validation
URL validation	You can configure a key and validate the URL to protect live resources.	For details, see URL Validation.
ACL	You can configure an IP address blacklist and whitelist to identify and filter out malicious visitors.	For details, see ACL.