If a license contaminate other software, we very probably can't include
it into non-free, as other non-free package won't follow this rule. So
such a package is not distributable by debian.
That probably doesn't follow. There may be limits to the contamination (such as media type) which prevent it hurting debian's non-free archives. For example, combining classes A-C and E of the "4F License" of http://u-os.org/4f/ would seem to produce a licence like that. (I recommend against using 4F, even though it doesn't have this particular problem.)
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