When a high definition (HD) multimedia contents such as audio and video travels from a device such as Blu-Ray player across DisplayPort, Digital Visual Interface (DVI), High-Definition Multimedia Interface (HDMI), Gigabit Video Interface (GVIF), or Unified Display Interface (UDI) connections, the signal is encrypted by High-bandwidth Digital Content Protection (HDCP), a form of digital copy protection developed by Intel Corporation.
The main objective of HDCP is to prevent the digital audio and video content from being eavesdropped, illegally played on devices that do not support HDCP, or been copied without authorization. HDCP performs the control by instructing transmitting device such as set-top box and Blu-ray disk player to check that the receiver such as HDTV is authorized to receive the data before starting to send the high definition data over the link.
For HDCP to perform encryption on the multimedia stream, an encryption key is required. And now, the master key of HDCP has leaked to Internet, which has been confirmed as real deal by Intel, the developer of HDCP. The HDCP master key can be used to crack the encryption which protects most HD and Blu-ray contents, effectively allow hackers to circumvent the DRM protection of HD video and audio content, especially on Blu-ray disc, which together with AACS
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