Format: http://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.