Your e-mail does not specify what material on www.brandonw.net is violating the anti-circumvention provisions of the Digital Millennium Copyright Act. I believe you may be referring to the details of the factorization of a 512-bit integer which can be used to install a community-created operating system for the TI-83 Plus series of graphing calculators. First, I have removed these details from the web site. Second, I would like to clarify some of your statements. You claim that this information infriges on TI-83 Plus operating system copyrights; I do not believe this is the case. This information allows an individual to digitally sign their own operating system, created without the help or use of TI's copyrighted code, and install it on real TI-83 Plus hardware. Such an operating system would in no way resemble the TI-83 Plus operating system, infringe on its copyright, or co-exist with it. You also claim that the TI-83 Plus operating system uses encryption to control access to the operating system code, which is also not the case. The recovery mode of the TI-83 Plus uses encryption to validate a received operating system. This recovery mode functions independently of the operating system and does not control or restrict access to the TI-83 Plus operating system; it merely ensures that a valid and intact operating system executes on the hardware. Third, there have been many third-party operating systems written for the TI-83 Plus series which do not rely on or borrow from the TI-83 Plus operating system in any way and do not, in my view, violate any copyright laws. A non-exhaustive list of operating systems can be found at http://www.ticalc.org/pub/83plus/os/ . Using the factors of the aforementioned 512-bit integer would allow any such operating system to be installed on TI-83 Plus series hardware without requiring the use of TI-83 Plus operating system exploits. I believe we can both agree that such exploits would constitute circumvention of protection within the TI-83 Plus operating system and is not a desirable solution to obtain the goal of executing a third-party operating system on actual hardware. By distributing a third-party operating system upgrade which can be installed in a straightforward and standardized way on an actual TI-83 Plus series calculator, users can take advantage of hardware which they own and in their own way, entirely independent of copyrighted TI-83 Plus operating system code. Fourth, I ask for clarification of why you object to the distribution and/or usage of this information. If it is not solely to prevent unauthorized modifications of copyrighted TI-83 Plus operating system code, do you also wish to prevent distribution of independently-created operating systems for the TI-83 Plus series? I await your reply so that you and I can decide how to proceed further on this matter.