livejournal: open source, GPL ljcom: source available, but not open source; not for use ljcomint: closed source.
www.livejournal.com draws from all three; clone sites technically can only use livejournal, but historically speaking many have also taken pieces from ljcom, since it's not actually possible to run a working production site on livejournal only without some hacking, and it lacks critical functions. (The payment system, for instance, is ljcom and not livejournal.)
Most everything LJ has that DW doesn't is ljcom, aside from a few things that are in livejournal but we hated the way they were implemented.
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mmmag
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Date: 2009-12-17 01:47 am (UTC)livejournal: open source, GPL
ljcom: source available, but not open source; not for use
ljcomint: closed source.
www.livejournal.com draws from all three; clone sites technically can only use livejournal, but historically speaking many have also taken pieces from ljcom, since it's not actually possible to run a working production site on livejournal only without some hacking, and it lacks critical functions. (The payment system, for instance, is ljcom and not livejournal.)
Most everything LJ has that DW doesn't is ljcom, aside from a few things that are in livejournal but we hated the way they were implemented.