"In a contract or transaction, a third-party is not a direct party of the contract, but has an indirect involvement."*

In this usage, "third party" refers to someone not involved in giving you the core Perl distribution. I'm so used to hearing this used in this sense in either software licensing or other computing related contexts that using it in relation to non-core modules seems pretty clear. Then again that may just be me . . .

* – Quoth one of the results for define:third party

In reply to Re: If it is not a core module, then what is it? by Fletch
in thread If it is not a core module, then what is it? by Anonymous Monk

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