Schneier has never really cared much for steganography and he seems to take every opportunity to belittle it. In _Secrets and Lies_, he argues that he's never received images in email and so steganography will fail for lack of a channel. In any case, there are plenty of business uses of whatever might be called steganography. The term itself is difficult to pin down because it could include many things that people do without realizing that they're engaged in steganography. Microsoft Office tags documents with the serial number of the document creator. The creator and everyone else who sees the document will never see this number, but it's there. I think the serial number is there to help them track down piracy and copyright infringement. The content creation companies from the music and movie business are also big believers in steganography. They hope the tool will allow them to mix in copyright messages into digital copies. The U.S. government has long explored ways to tag documents, presumably to help track classified information that might fall into the hands of terrorists. U.S. government agents in pursuit of terrorists must often use steganography to communicate with other agents. Hiding the message stream may be the only way they can maintain their cover. Lately the press has been focusing on the unproven possibility that the terrorists may use steganography to communicate. The complete story should include how the technology is used against terrorism and digital piracy.