compatibility and the OSD

[Ken Arromdee]

On Mon, 20 Sep 2004, Bob Scheifler wrote:
> 1. The licensed work consists of source code, test suite in executable
>     form, and test suite documentation.
> 2. A derivative work in executable form that has passed the unmodified
>     test suite can be distributed under a license of your choosing.
> 3. Any other derivative work can only be distributed under this license.
>     Any such distribution must include the unmodified test suite and
>     test suite documentation.

What's to keep someone from making a derivative that passes the test suite,
then distributing it under BSD using clause 2, then taking the BSD-licensed
copy (to which clauses 1-3 no longer apply, since it is BSD licensed and not
under your license any more), modifying it to fail the test suite, and
distributing it?