On Tue, 23 Jan 2018, Tignor, Tom wrote:

>    @@ -418,7 +419,8 @@
>
>    We don't normally list contributors in the copyright section. The copyright
>    to PostgreSQL global development group is intended to cover all
>    contributors.
>
> ttignor – I’ve gone a few rounds on this with our opensource group. As I 
> understand the issues, there is a choice to either maintain or assign away 
> the Akamai copyright for the code I wrote.  Per our previous discussion, 
> we’re maintaining the Akamai copyright. This is accomplished by header 
> comments and/or some meta-data in the patch. If the header comment is a 
> problem, then the patch meta-data becomes essential. If slony1-hackers can 
> agree on exactly what copyright changes are needed, I can take them back 
> to Akamai opensource. --------

I am not exactly sure what you mean by meta-data. Can you explain?
We can provide credit in the commit comments and release notes.

Slony follows the same principal as the main postgresql source code.
This is sort of discussed at 
https://wiki.postgresql.org/wiki/Developer_FAQ#Do_I_need_to_sign_a_copyright_assignment.3F

Slony contributors maintain the copyright to their contributions.  The 
credit at "Copyright (c) 2003-2009, PostgreSQL Global Development Group"
As I understand it, the 'PostgreSQL Global Development Group" does not exist 
as a legal entity.  By contributing your code to slony you share in the 
copyright with all the other contributors.  You become one of the rights 
holders (in effect part of PGDG).

I am not a lawyer or copyright expert. The above is just my attempt 
paraphrase things and should not be taken with any legal significance.

I wouldn't have a problem with changing the date in the copyright notice 
from 2003-2009 to 2003-2018. The issue is with listing each contributor 
in each file.

Steve