[tz] Fwd: Bulletin C number 57

[Paul Eggert]

Brian Inglis wrote:
> suggests CC-PDM, CC0, ODC-PDDL, OGL, or EUPL may be suitable depending on which
> explicit permissions are required and whether obligations should be applied.
> 
> Which of these are preferred by the masintainer?

The intent of the tzdb (see Internet RFC 6657 section 7) is that it be in the 
public domain, so CC-PDM sounds like it's the most-appropriate. CC-BY 4.0 places 
more requirements than what RFC 6657 would allow, so it would be more problematic.