open source license with 24 month proprietary clause

[Brett Glass]

At 09:16 PM 5/3/2003, Jeremy C. Reed wrote:
  
>Has anyone heard of an open source license where new code based on it can
>be kept proprietary for 24 months?

Jeremy, you're misusing the word "proprietary" in the same way that
Stallman does. Also, what if market conditions make it impossible
to recoup one's investment in 24 months, or you decided to sell
your business a year later?  It could turn into a "time bomb license."

If you want to give something away, give it away. If you cannot afford
to give something you own away, there's no shame in keeping it. Simple
as that.

--Brett