Users are provided with hosting for their site and a Web-based interface where they can enter their posts. (Disclosure: Forbes.com uses the TypePad service to power its blogs, including one by the author of this story.) Six Apart also operates LiveJournal, a popular free blogging service, and sells Movable Type, blogging software which companies and individuals can install on their own Web servers.
The government may simply insist that 3D printer manufacturers install software that prevents printing of a hollow cylinder of a certain size, a firing pin, or a certain type of spring.