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我通过TCP/IP从编码器接收HDCP 加密的 H264内容到 PC。我需要解密并将缓冲区传递给 GPU 以进行解码和HDMI（HDCP 加密）输出。我打算在TEE内部进行完整的处理。我在哪里可以存储HDCP 加密密钥？