You can limit access to your content for listed countries. To enable the option navigate to CDN Resources, click Settings, open the Advanced Settings, in the Access (Security) click Add Policy and find Country Access Policy.

By default, there are no restrictions by country to your CDN Resource. You can set up Allow or Block policy.
Important! You can specify countries only one by one via Control Panel. To add the list of the countries, use API.

Allow Country Access Policy

Access to the Resource is allowed for all the countries except for the specified in the field.

Block Country Access Policy

Access to the Resource is denied for all the countries except for the specified in the field.