> granted by Adobe to individuals and organizations that desire to develop, market, and/or distribute hardware and software that reads and/or writes image files compliant with the DNG Specification.
If I use it for something it's not images because I want to create a DNG file that's a DNG file and a Gameboy ROM at the same time. Or if I'm a security researcher testing non compliant files. Or if I'm not a great developer or haven't had enough time to make my library perfectly compliant with the specification... Will I be sued for breaking the license?
You not only have to remove DNG-support on those products, but due to warranty-law in many countries have to provide an equivalent feature to the customer (--> develop a converter application again, but this time for products you already closed development for years ago).
Alternative would be to settle with Adobe to spare the cost for all that. So Adobe has all the cards in this game.
Now: Why bother transitioning your customers to DNG...?
Considering that you entered this discussion instantly claiming that others are wrong without having even read the license in question makes this conversation rather..."open-ended"
> Also, the right of revocation only applies if the DNG implementor tries to sue Adobe. Why would they do that?
As I wrote above, Adobe reserves the right to use every patent that happens to be used to create this DNG from your design at no cost, and will revoke your license if you disagree i.e. with what they do with it.
> Occam's razor here suggests [..]
Or, as I suggested, it's simply hard to make a case in favor of developing and maintaining DNG with all that burden if you anyway have to support RAW