[tz] leapseconds.awk, LEAP directives and references

[Paul Eggert]

On 04/09/2017 05:59 AM, Marshall Eubanks wrote:
> I confirm that IERS  allows for unlimited copying and use of
> this and other EOP file,...as far you mention the reference!

Thanks, this is good news, as it should let us redistribute the file as 
part of the tz database. To make the legal situation clear to everybody, 
would you please state the copying terms in or near the files in 
question? For example, you could add the following text to the contents 
of <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>:

   # Copyright 2017 International Earth Rotation and Reference Systems 
Service.
   # This file is licensed under the Creative Commons Attribution 4.0
   # International License. To view a copy of this license, visit
   # http://creativecommons.org/licenses/by/4.0/ or send a letter to
   # Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.

Another possibility is to put similar text into 
<https://hpiers.obspm.fr/iers/bul/bulc/README> and mention that your 
copyright notice applies to all the files in that directory.

I am suggesting the CC BY 4.0 license because it matches the intent 
stated informally in your email; the wording above is taken from 
<https://creativecommons.org/choose/non-web-popup?license_code=by&amp;version=4.0>. 
Your organization may prefer some other license and/or wording; the 
details don't matter as long as it's clear that downstream users can 
copy the file unaltered and can use the file's data without restriction.

The above text assumes that the IERS holds the copyright; if not, please 
substitute the correct copyright holder's name.

Thanks again.