Now Adobe, which controls Flash and Flash Video, is trying to change that with the introduction of DRM restrictions in version 9 of its Flash Player and version 3 of its Flash Media Server software. Instead of an ordinary web download, these programs can use a proprietary, secret Adobe protocol to talk to each other, encrypting the communication and locking out non-Adobe software players and video tools. We imagine that Adobe has no illusions that this will stop copyright infringement -- any more than dozens of other DRM systems have done so -- but the introduction of encryption does give Adobe and its customers a powerful new legal weapon against competitors and ordinary users through the Digital Millennium Copyright Act (DMCA).