Public domain software is not open-source?

[Matthew Flaschen]

Philippe Verdy wrote:

> But I also think that the absence of such explicit statement is also a lie,
> by omission,

Again, the absence of a copyright notice is not usually a lie by 
omission.  It would only be a lie if someone claimed to license 
something they didn't own.  You are invented rules where there are none.

Matt Flaschen