Generally "Nulled" scripts are programs like vBulletin, WHMAP [crap software - never buy it] that require licenses to work. However, once the software is nulled, it does not require a license to work, and is "hacked."
Some times if a script is encoded with the Zend Guard - people can "dezend" it, and it is also nulled. To my knowledge, there is no need to null opensource software - because there is no encryption / licenses needed.
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