Xs4all Internet will rotate the IP-numbering of the website www.xs4all.nl to ensure that it's 3100 userpages will all remain available for any internet-user.
While you are at it, you could move just the censored material to a separate IP address from the rest of the archives, and issue Web redirects for requests sent to the old address. In fact it might be interesting to redirect readers to various mirror sites automatically, at random and in rotation. Thus, when someone connects to your web site to read censored material, they will be automatically redirected to one of dozens or hundreds of other places where the material can be found. The German censors will likely find it impossible to block access to all those sites (and each such site can also be changing its IP address periodically). It's my impression that the draft Mobile-IP protocols will make it possible for a site to use IP addresses from all over the Internet. Mobile IP is normally designed for permitting a physical host to move to various physical locations while retaining a fixed logical IP address (corresponding to its "home" location). It can probably also be used to permit a physical host at a single physical location to respond to multiple logical IP addresses at multiple virtual "home" locations. See http://www.ietf.org/html-charters/mobileip-charter.html, or search for "Mobile IP" in a web search engine. The Mobile IP protocols require strong authentication in order to "move" around the network securely. We hope this will prevent them from being used to subvert Internet hosts. However, in the presence of *cooperation* from a variety of Internet sites, they can also be used to make the physical location and Internet-address of actual stored information invisible to the requesters of that information -- and to the censors attempting to block access to it. Curiously enough, the National University of Singapore has implemented Mobile IP for Linux! See http://zaphod.ee.nus.sg/mip/. Even in the backyards of the most egregious censors, freely available technology for combatting censorship is being built and distributed. (A second Linux implementation from http://anchor.cs.binghamton.edu/~mobileip/ is also available.) John Gilmore