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It works by encrypting a digital signal with a key that requires authentication from both the transmitting and receiving products. If authentication fails, the signal fails.

The Digital Content Protection LLC, the Intel subsidiary organization that licenses HDCP, describes its purpose as to license technologies to protect high-value digital movies, TV shows, and audio from unauthorized access or copying. The use of HDCP-compliant cables and devices to transmit HDCP-encoded data, in theory, is designed to prohibit the duplication or re-recording of encrypted media by unauthorized devices.

Put differently: Years ago, people purchased two video cassette recorders, then chained them in series. You'd play a VHS tape, but the signal from that VCR fed a second VCR with a blank tape set to record. That second VCR then fed the TV, so that you could watch and copy movies simultaneously without difficulty or detection. The use of HDCP devices and cables now precludes this behavior unless you take extraordinary steps to acquire or modify devices to strip the HDCP encoding from a stream.

The most recent HDCP version is 2.3, which was released in February 2018. Many products on the market have a previous HDCP version, which is fine because HDCP is compatible across versions.

Sony Pictures Entertainment Inc., The Walt Disney Company, and Warner Bros. were early adopters of HDCP encryption technology.

It's not easy to pinpoint which content has HDCP protection, but it could be encrypted in any form of Blu-ray disc, DVD rental, cable or satellite service, or pay-per-view programming.

The DCP has licensed hundreds of manufacturers as adopters of HDCP.

HDCP is relevant when you use a digital HDMI or DVI cable. If every product using these cables supports HDCP, then you shouldn't encounter any problems. HDCP is designed to prevent theft of digital content, which is another way of saying illicit recording. As a result, the HDCP standard limits how many components you can connect. Most people won't mind, but some applications (for example, feeding a bank of TVs at a sports bar) present difficulties.

If all the products used are HDCP-certified, the consumer won’t notice anything. The problem occurs when one of the products isn’t HDCP-certified. A key aspect of HDCP is that it isn't required by law to be compatible with every interface. It’s a voluntary licensing relationship between the DCP and various companies.

Still, it’s a shock to the consumer who connects a Blu-ray disc player to an HDTV with an HDMI cable only to see no signal. The solution to this situation is to either use component cables instead of HDMI or to replace the TV. That’s not the agreement most consumers thought they agreed to when they bought an HDTV that is not HDCP licensed.

Products with HDCP fall into three buckets—sources, sinks, and repeaters:

For the curious consumer who wants to verify whether a product has HDCP, the DCP publishes a list of approved products on its website.

No firmware upgrade can turn a non-HDCP input into an HDCP-compliant one. If you recently bought an HDTV, you might get an HDCP error when connecting a Blu-ray disc player to your TV via an HDMI cable. In this case, you'd have to choose between using a non-digital cable or buying a new HDTV or Blu-ray player.

HDCP is a purely digital technology that relies on DVI and HDMI cables. That's why you'll often see acronyms like DVI/HDCP and HDMI/HDCP. HDMI stands for High-Definition Multimedia Interface. It's a digital interface that allows your HDTV to render the best uncompressed digital picture possible. HDMI has tremendous support from the motion picture industry. Some of the heavyweights in the consumer electronics industry like Hitachi, Matsushita, Philips, Silicon Image, Sony, Thomson, and Toshiba helped create it.

Created by the Digital Display Working Group, DVI stands for Digital Visual Interface. It is an older digital interface that has all but been replaced by HDMI in televisions. There are two significant advantages of HDMI over DVI:

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