"Is software truly open source More about open source if you pay
for additional features? Your answer may depend on whether you side
with the purists or the, ah, not-so-pure.
"A recent trend entering the debate involves the marketing of
so-called open core software. This morphed business model is not
what many open source supporters consider "pure" open source.
However, open core may come to be the standard bearer in the
business software arena.
"Open source pundits have been debating the question for about a
year as they try to outline the best possible open source business
model. Open core supporters suggest that this latest licensing
model will satisfy those trying to balance customer value with
investor return while not ignoring community facilitation.
""The merits of open core have been debated poorly until
recently," Andrew Lampitt, cofounder at zAgile and director of
business development for Jaspersoft, told LinuxInsider."