ITAR

[lcs Mixmaster Remailer]

If someone writes a piece of software, a networking layer, or anything else
with support for later cryptographic enhancement but doesn't actually
include the cryptographic implementation and it is later added by somebody
outside of the United States does this fall under ITAR? 

In other words the original U.S. authors wrote the software with support for
crypto, function hooks, etc. They didn't include any crypto at all. Somebody
outside the United States uses these hooks and writes strong cryptography.
These modifications are kept as patches and never exported from the U.S.. Is
this allowed? What if the U.S. authors are actively collaborating with the
non-US authors?