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Not to be a techhead, but this could also refer to the underground practice of capturing streaming video or audio that was not meant to be captured. Typically this is done by inserting a hacked mixer or sound driver into the OS.

For example, one could accomplish this feat on Realaudio/Realmedia (.rm) streams, icecast streams, streaming mpegs, or quicktime streams. (not to mention stickin' it to the DVD CCA by h4X0ring your DVD video after it has been decrypted...)