A report from Russian cybersecurity firm F6 has found that around 61 percent of illegal Russian streaming sites rely on the content delivery network (CDN) Alloha.

Despite efforts to clamp down on pirated content, F6 said that although revenues had fallen significantly since 2018, the volume of content has grown. The report said 12.5 million units of pirated content were blocked - 42 percent more than the previous year.

CDNs emerged in the late 1990s, with players like Akamai and Cloudflare speeding up web page performance by caching content close to users.

Following Alloha, CDN Rewall, which operates from a domain in India, was relied upon by 42 percent of sites analyzed by F6, with Lumex taking third place with 11 percent. Kodik and HDBV took fourth and fifth spots, with nine and seven percent, respectively.

As a report from Torrent Freak noted, because the total adds up to more than 100 percent, a number of the pirate websites appear to be using multiple CDNs to support their services.

The networks are able to operate by using CDN infrastructure in the Netherlands, the United States, Ukraine, Germany, and France, the report said, which makes it difficult for Russian authorities to block them as they are not hosted domestically.