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for RealMedia and Windows Media. The software looks, to the streaming media server, like a regular player, but the spoofing client is designed to write the streamed data to disk. Streambox VCR was a product that allowed any RealMedia stream to be saved and was the subject of a lawsuit by RealNetworks. The suit was settled out of court and the feature was removed from the software, but older versions of the software still circulate. Another utility called ASFRecorder allows Windows Media streams to be saved to disk. To date, Microsoft has taken no action to attempt to remove ASFRecorder from circulation. There is currently little demand for QuickTime spoofing clients, since QuickTime security is almost nonexistent. Encryption provides a measure of protection against client spoofing, since it adds a significant engineering challenge to authors of spoofing clients to implement the decryption software. The software must now include key exchange software and encryption routines compatible with the originals, which must be written or else extracted from the target player and used in the new software. This represents more work than most casual hackers are willing to expend, although it isn t completely impossible. On-the-fly encryption systems need to take steps to ensure that the client requesting the data is a known, legitimate client. This can be done by inspecting various characteristics of the calling application and the runtime environment of the computer, or even by deliberately forcing errors and expecting signature errors as a response. Since the test that the on-the-fly decrypter uses to validate the client could eventually be reverse engineered and defeated by the spoofing client, the on-the-fly encryption system should allow tests to be updated, to keep one step ahead of the hackers. The term IP stack hacking refers to attacks on the part of the operating system that deals with the TCP/IP and other Internet protocols. In most operating systems it is possible for an application to insert a callback into the IP stack, allowing a bit of code, external to the stack, to be called each time a packet is sent or received. This allows an external program to copy data from streams as they pass through the IP stack, saving the data to disk as it is collected. Encryption is the first line of defense against extracting streaming data from the IP stack. It is theoretically possible to defeat on-the-fly decrypters simply by extracting the data after the IP data in the stack has been decrypted, but most on-thefly decrypters remove themselves from the calling chain and reinsert themselves at the end as the stream begins. They can also be designed to detect any irregularities in the IP stack and shut down the stream if the IP stack is compromised.
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Another technique for stealing streaming media is called packet sniffing. Here the IP stack is hacked outside the client machine. The stream is monitored as it moves across the LAN to the client and the packets are snatched as they pass by a second machine. Packet-sniffing programs are widely available for UNIX, Windows, and the Mac OS. Once the packets are captured to a file, you can massage the data to recover the streaming media payload. The best defense against this is strong encryption that renders the captured stream useless without the appropriate key. Firewalls, proxies, and routers can be compromised in order to steal streaming media. For example, many proxy servers already contain code to cache Internet documents locally. Such proxies might be capable of being configured to save TCP/IP streaming video and audio to disk, since they are already saving other types of files for the local cache. If the proxy (or firewall or router) is software based, it might be possible to obtain the source code (assuming it is open source, as many programs are today) and design the software so that it saves files to the bridge machine s hard disk. Once stored there, of course, the file can be copied anywhere. It is important to note that this need not take place in an office network environment where the use of a proxy is required. A hacker might set up a compromised proxy or network address translation router at home, specifically to capture streaming media as it passes through on its way to a second box. One way to prevent this theft technique is not to allow streaming at all via TCP/IP, but this leaves streams unable to penetrate firewalls. Encryption is a far better deterrent, since a well-designed encryption system allows streams to pass through firewalls, routers, and proxies unhindered while providing security against capturing a usable version of the stream. Screen scraping is the vernacular term used to describe the grabbing of uncompressed video as it is written to the screen, or immediately after it has been written. This can be done either by intercepting the actual API calls that write the uncompressed bitmap to the screen, or by running a background task that periodically (i.e., every frame) interrupts the computer to copy the particular segment of display memory, which the player is using to write the uncompressed video data to disk. Because most streaming media players write directly to display memory, for speed reasons, it can be difficult to get good-quality screen scrapes. However, we can expect screen-scraping techniques to be refined as other security loopholes get closed. A number of commercial utilities are already available to capture a screen session to a video file. There are only a few ways to defeat screen scrapers (and their audio
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