} Subject: Re: Licensing constraints...?????
} > 
} > True. I think that's why CTM'd need some sort of promise from the user to
} > actually use the diffs. Like you get a copy of the source for the day when
} 
} Encrypt the diffs using a checksum of the file the diff is to be applied
} against. Or, have the protocol use a checksum of the file to be diff'd to
} request the diff in the first place.

As a simpler solution, why not simply prepend this to each message:

	Copyright (c) <year> The NetBSD Foundation, Inc.
	All Rights Reserved.

	The NetBSD Foundation grants the right to use the information
	contained in this message provided that the user agrees to
	accept and abide by the license terms of the files from which
	these patches were generated. That is, patches contained in this
	message for a specific file may only be used under the same
	license terms as the original file.

Or something to that effect (perhaps have a lawyer write something a
little better). That should be enough, right?