All-American Open Source?

Every once in a while we get an interesting question on the CPAN list and today someone asked if "Are all the modules on this site U.S.? If so, where can i find proof of it on the site?" Jarkko noted that the email address was that of a government security contractor so the question became even more curious. I sent the person an email asking the reason behind the question and, apparently, it is a requirement the government has that security stuff be all verifiable 'US' code.

Interesting.

So, what I want to know now is how does one define 100% US Choice Code and how do they plan to keep it that way considering the internet blurs lines of nationality. So...how does someone define "US" code?