I've seen so many links which have this title:
ioncube php encoder nulled
What does it mean?
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According to this discussion site for website admins, nulled means:
I'd never heard the term before and, judging from what I found on Google, I think it's jargon only used by site admins who share software.
David Schwartz (see discussion below) tells us that "null" means "remove the anti-piracy features". This term is only used for scripts and, contrary to the quote above, it does not necessarily mean that the software has been pirated.