selling GPL sources

[Rick Moen]

Quoting Mahesh T. Pai (paivakil at yahoo.co.in):

> Rick Moen said on Mon, Sep 19, 2005 at 04:57:17PM -0700,:
> 
>  > So, he'll have to sue himself for copyright infringement?
> 
> No,  the  user  can sue  the  copyright  holder  for violation  of  an
> undertaking!!!
  ^^^^^^^^^^^

Sounds grave.

But it doesn't sound like tort law.  Strictly rhetorical question:  Can
you tell me what specific variety of tort "violating an undertaking" is?

> The  BSD licence, unlike  the GPL,  does not  impose an  obligation to
> provide the source code.

This is, of course, irrelevant to my point.