Public domain software is not open-source?

[Matthew Flaschen]

Philippe Verdy wrote:
>> Again, he has no obligation to put a copyright notice.
> 
> I did not say that he MUST put a copyright notice, but that it MUST do that
> IF he wants to LICENCE it. Otherwise the licence is just FUD!

You're simply incorrect.  The license is completely valid either way. 
The copyright holder has no need to place a notice.

> And YES! he is a liar if he gives a licence without a copyright statement,
> i.e. an explicit claim of ownership of the rights covered by the licence.

If I say something true without proving it, I am not a liar.  It is your 
responsibility to verify the license if you choose to rely on it, not 
the other way around.

Matt Flaschen