"The mixed-source model is essentially similar to the first, but
involves the grudging acknowledgment that some open source products
are okay-ish, while, at the same time, suggesting that what you
really need is the vendor's fine proprietary software to do the
"Unsurprisingly, this model only works when combined with legal
threats and the encumbrance--real or presumed--of software patents
and other barriers to entry.
"Minimal benefits are passed on to the user in a "buy this and
we'll throw in one of these for free" approach that also
perpetuates the mixed-source vendor's propaganda that free software
is not as good as proprietary."