Problems
HDCP can cause problems for users who want to connect multiple screens to a device; for example, a bar with several televisions connected to one satellite receiver or when a user has a closed laptop and uses an external display as their only monitor. HDCP devices can create multiple keys, allowing each screen to operate, but the number varies from device to device; e.g., a Dish or Sky satellite receiver can generate 16 keys. The technology sometimes causes handshaking problems where devices cannot establish a connection, especially with older high-definition displays.
Edward Felten wrote "the main practical effect of HDCP has been to create one more way in which your electronics could fail to work properly with your TV," and concluded in the aftermath of the master key fiasco that HDCP has been "less a security system than a tool for shaping the consumer electronics market."
Additional issues arise with interactive media (i.e. video games) from control latency due to the additional processing (encoding/decoding) required. Further, use cases such as live streaming or capture of game play, are also adversely affected.
Read more about this topic: High-bandwidth Digital Content Protection
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—Eda Le Shan (20th century)