A legitimate, licensed HDMI cable will be labeled as to which of the four types it adheres to. The label might be in the form of a flag, as shown here, or it might be printed on the cable jacket.
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There's nothing complicated about buying the right HDMI cable. If it's long enough and not damaged, it should work.
But the people selling the cables may not want you to know that. The more worried you are about buying the right cable, the more likely you'll spend more money.
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