[Minor plug: I am scheduled to give a talk on TCPA at this year's DEF CON security conference. I promise it will be an interesting talk. http://www.defcon.org ]
Below are two more additional TCPA plays that I am in a position to mention: 1) Permanently lock out competitors from your file formats. >From Steven Levy's article: "A more interesting possibility is that Palladium could help introduce DRM to business and just plain people. It's a funny thing," says Bill Gates. "We came at this thinking about music, but then we realized that e-mail and documents were far more interesting domains." Here it is why it is a more interesting possibility to Microsoft for Palladium to help introduce DRM to business and "just plain people" than to solely utilize DRM to prevent copying of digital entertainment content: It is true that Microsoft, Intel, and other key TCPA members consider DRM an enabler of the PC as the hub of the future home entertainment network. As Ross pointed out, by adding DRM to the platform, Microsoft and Intel, are able to grow the market for the platform. However, this alone does little to enhance Microsoft's already sizable existing core business. As Bill Gates stated, Microsoft plans to wrap their entire set of file formats with DRM. How does this help Microsoft's core business? Very simple: enabling DRM for MS Word documents makes it illegal under the DMCA to create competing software that can read or otherwise process the application's file format without the application vendor's permission. Future maintainers of open source office suites will be faced with a very simple choice: don't enable the software to read Microsoft's file formats or go to jail. Anyone who doubts that such a thing could happen is encouraged to familiarize themselves with the case of Dmitry Skylarov, who was arrested after last year's DEF CON conference for creating software that permitted processing of a DRM-wrapped document file format. Permanently locking out competition is a feature that of course does not just appeal to Microsoft alone. A great many dominant application vendors are looking forward to locking out their competition. The beauty of this play is that the application vendors themselves never need to make that call to the FBI themselves and incur the resultant backlash from the public that Adobe experienced in the Skylarov case. The content providers or some of those utilizing the ubiquitously supported DRM features will eagerly make that call instead. In one fell swoop, application vendors, such as Microsoft and many others, create a situation in which the full force of the U.S. judicial system can be brought to bear on anyone attempting to compete with a dominant application vendor. This is one of the several ways in which TCPA enables stifling competition. The above is one of the near to medium objectives the TCPA helps meet. [The short-term core application objective is of course to ensure payment for any and all copies of your application out there]. Below is a mid to long term objective: 2) Lock documents to application licensing As the Levy article mentions, Palladium will permit the creation of documents with a given lifetime. This feature by necessity requires a secure clock, not just at the desktop of the creator of the document, but also on the desktops of all parties that might in the future read such documents. Since PC's do not ship with secure clocks that the owner of the PC is unable to alter and since the TCPA's specs do not mandate such an expensive hardware solution, any implementation of limited lifetime documents must by necessity obtain the time elsewhere. The obvious source for secure time is a TPM authenticated time server that distributes the time over the Internet. In other words, Palladium and other TCPA-based applications will require at least occasional Internet access to operate. It is during such mandatory Internet access that licensing-related information will be pushed to the desktop. One such set of information would be blacklists of widely-distributed pirated copies of application software (you don't need TCPA for this feature if the user downloads and installs periodic software updates, but the user may choose to live with application bugs that are fixed in the update rather than see her unpaid software disabled). With TCPA and DRM on all documents, the application vendor's powers increase vastly: the application vendor can now not just invalidate copies of applications for failure to pay ongoing licensing fees, but can invalidate all documents that were ever created with the help of this application. Regardless how widely the documents may have been distributed or on who's computer the documents may reside at present. Furthermore, this feature enables world-wide remote invalidation of a document file for reasons other than failure to pay ongoing licensing fees to the application vendor. To give just one example, documents can be remotely invalidated pursuant to a court order, as might be given if the author of the document were to distribute DeCSS v3 or Scientology scriptures in the future DRM protected format. All that is required to perform such an administrative invalidation of a document is either a sample copy of the document from which one can obtain its globally unique ID, the serial number of the application that created the document, or the public key of the person who licensed the application. (Other ways to exist but are omitted in the interest of brevity). --Lucky Green --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to [EMAIL PROTECTED]
