The protocol is used to protect video and audio content as it is transmitted between devices through encryption, and check if the device is licensed to share content.
Intel confirmed last week that the master key that the original was published online and are now investigating whether it was stolen or crack-look.
In HDCP key establishes a shared secret key, using public and private keys of the devices, and will be used to encrypt communications between two devices.
But everyone knows and can see the master key can break HDCP key encryption key, according to Ed Felten, director of the Center for Information Technology Policy at the University of Princeton.
"HDCP not guarantee that the participating devices are licensed, unlicensed devices because the manufacturer can use a keygen to create public and private key pairs correct," he wrote in a blog post.
After nearly a decade, Danish cryptographer Niels Ferguson claimed to have found a way to avoid HDCP.
"If this master key is ever published, HDCP will provide no protection. Flaws in HDCP are not hard to find."
At that time, Ferguson said he has no intention to publish discoveries made because of fear of starting legal action against him.
Intel says it will not be easy for anyone to use cheiele in practice, but said he would bring legal action, if necessary, to defend its intellectual property.
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