调查员有几个工具可以帮助找到泄漏源，包括数字水印，演播室说。
Investigators have several tools to help find the source of the leak, including digital watermarking, the studio said.
数字水印的研究对象主要包括静止图像、视频和声频信息。
What digital watermarking technique mainly research on is still images, video and audio signals.
信息隐藏技术包括隐写术，隐信道技术，数字水印技术等。
Information hiding techniques including steganography, Covert channel, digital watermark technology.
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