On 2023-12-08 15:04, Brooks Harris via tz wrote:
On 12/8/2023 3:58 PM, Paul Eggert wrote:
On 2023-12-08 11:58, Brooks Harris via tz wrote:
anything from IERS must be public domain, isn't it? How is it not?
It’s published in France and French law does not recognize the US notion of public domain. The French “domaine public” is more restrictive than the US notion, and as I understand things if published in France the file cannot be domaine public anyway; that can happen only 70 years after publication.
The IERS version lacks a copyright notice, and it’s not clear who holds the copyright or under what terms TZDB could legally reproduce the file. The copyright holder might be the IERS, the Paris Observatory, Paris Sciences et Lettres University, the Ministry of National Education, or some other body. A while ago I asked for a proper copyright notice to be added, to clarify rights and establish permissions, but this has not gotten anywhere presumably because the people in charge of the IERS version are busy and don’t think this is important.
Given the legal uncertainty it’s safer for TZDB to not copy the IERS version. Thanks.
As far as I can tell there is no "leap-seconds.list" file at IERS. This NIST file appears to be a reconstruction of the IERS leap-second data, either assembled from Bulletin C, or transposed from the "Leap_Second_History.dat" file at https://hpiers.obspm.fr/eoppc/bul/bulc/Leap_Second_History.dat.
On most leap seconds sites, leap-seconds.list is usually a symlink to leap-seconds.NTPTIME, where NTPTIME is usually the integer NTP time stamp at 0Z on the date of the most recent bulletin C, or the local issue date e.g. $ curl ftp://hpiers.obspm.fr/iers/bul/bulc/ntp/ -rw-rw-r-- 1 ftp ftp 540 Jul 06 2016 README -rw-rw-r-- 1 ftp ftp 4928 Apr 03 2015 leap-seconds.3637008000 -rw-rw-r-- 1 ftp ftp 4928 Jul 07 2015 leap-seconds.3645216000 -rw-rw-r-- 1 ftp ftp 4927 Sep 16 2015 leap-seconds.3651350400 -rw-rw-r-- 1 ftp ftp 4928 Jan 11 2016 leap-seconds.3661459200 -rw-rw-r-- 1 ftp ftp 4928 Jan 13 2016 leap-seconds.3661632000 -rw-rw-r-- 1 ftp ftp 4920 Jul 06 2016 leap-seconds.3676752000 -rw-rw-r-- 1 ftp ftp 4925 Jan 19 2017 leap-seconds.3693772800 -rw-r--r-- 1 ftp ftp 4921 Jul 07 2017 leap-seconds.3708374400 -rw-r--r-- 1 ftp ftp 4923 Jan 09 2018 leap-seconds.3724483581 -rw-r--r-- 1 ftp ftp 4921 Jul 05 2018 leap-seconds.3739787886 -rw-r--r-- 1 ftp ftp 4949 Jul 04 2019 leap-seconds.3771235866 -rw-r--r-- 1 ftp ftp 4953 Jan 07 2020 leap-seconds.3787382231 -rw-r--r-- 1 ftp ftp 4949 Jul 07 2020 leap-seconds.3803144275 -rw-r--r-- 1 ftp ftp 4953 Jan 07 2021 leap-seconds.3819011916 -rw-r--r-- 1 ftp ftp 4949 Jul 05 2021 leap-seconds.3834432000 -rw-r--r-- 1 ftp ftp 4953 Jan 05 2022 leap-seconds.3850377469 -rw-r--r-- 1 ftp ftp 4949 Jul 05 2022 leap-seconds.3865995417 -rw-r--r-- 1 ftp ftp 4953 Jan 09 2023 leap-seconds.3882249427 -rw-r--r-- 1 ftp ftp 4949 Jul 04 13:06 leap-seconds.3897417600 lrwxrwxrwx 1 ftp ftp 23 Jul 04 13:06 leap-seconds.list -> leap-seconds.3897417600 drwxr-xr-x 2 ftp ftp 4096 Apr 03 2015 sources Also https://hpiers.obspm.fr/iers/bul/bulc/ntp/?C=M;O=D and the other Bulletin C data: https://hpiers.obspm.fr/iers/bul/bulc/?C=M;O=D
The NIST file does not appear to explicitly say its in the "public domain". But, as I understand it, anything NIST says, does, or publishes is in "public domain" as far as USA law goes. Hopefully this just remains a matter of my inexpert curiosity.
Other referring documents remind users that most documents and data on sites are in the public domain in the US: https://www.nist.gov/open/copyright-fair-use-and-licensing-statements-srd-da... -- Take care. Thanks, Brian Inglis Calgary, Alberta, Canada La perfection est atteinte Perfection is achieved non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add mais lorsqu'il n'y a plus rien à retirer but when there is no more to cut -- Antoine de Saint-Exupéry