Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Source: http://rorf.usno.navy.mil/ICRF/

Files: *
Copyright: None
License: public-domain
 The website of USNO contains the following statement in
 http://ad.usno.navy.mil/privacy.shtml :
 .
 2. All information presented on these pages is considered public
 domain and may be distributed or copied unless otherwise
 specified. Use of appropriate byline/photo/image credits is
 requested.