yes:
From http://www.itl.nist.gov/iad/894.03/nigos/NIGOS_licdis_061...
"This software was developed at the National Institute of Standards and Technology (NIST) by
employees of the Federal Government in the course of their official duties. Pursuant to title
17 Section 105 of the United States Code. This software is not subject to copyright protection
and is in the public domain."
As for the export control (non-)issues, see my writeup at:
http://www.reactivated.net/fprint/wiki/US_export_control