Because uncontrolled molecular manufacturing (MM) could be quite dangerous, the best solution appears to be careful and comprehensive administration of advanced nanotechnology, including some mandatory restrictions. Fortunately, the same features that make MM dangerous also allow the implementation of several kinds of technological restriction that may form useful components of an overall administration program.
Products that might be adapted for unauthorized molecular manufacturing pose a serious threat to nanotech security. Other products pose other kinds of threats, and additional restriction will probably be desirable. Still, many products, once approved, could be built freely—and for some classes of products, approval should be a rapid and automated process. Nano-built functionality will be amazingly compact: a supercomputer could fit inside a grain of sand. This allows a human-scale product, such as a tabletop nanofactory, to include dedicated security or monitoring hardware. Massive computer power can help with several other problems, including privacy-safe surveillance and patent reform.
If you've studied CRN's research to any significant degree, it should be clear by now that no simple solution will work—any effective solution must be multifaceted. Technological capabilities and restrictions deserve special attention because of the unprecedented power and compactness of the technology. This power and compactness is what makes nano-built products so dangerous. However, it also allows the design and use of very small security devices. Surveillance and/or restrictive devices can be integrated into many products of MM, including nanofactories. On our main website, we describe a system called Embedded Security Management for applying flexible controls at the most effective points.
Before raising objections, please read at least this whole page, including the "Devil's Advocate" questions and answers at the bottom. It's vital that such discussions move forward in a constructive way, because time may not be on our side. You can contribute most effectively by first developing a thorough understanding of the issues, the proposed solutions, and the complex interactions between them.