Violations of λ-independence introduce hidden variable conspiracies that, by definition, remove the experimenter's ability to freely choose measurement settings, thereby undermining the signaling channel itself.

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Free choice (or freedom of choice)(as used in quantum mechanics experiments): In this context, the ability of an experimenter to independently decide what measurement to perform without that choice being influenced by the system being measured.
Hidden variable conspiracies(as used in quantum mechanics debates): Scenarios where hidden properties would have to coordinate in an implausibly coordinated way to produce the results we observe, making the theory seem artificially rigged.
Hidden variable theory(as used in philosophy of quantum mechanics): The idea that quantum particles have properties that exist even when we're not looking at them, and these invisible properties determine what happens when we do measure.
Measurement settings(as used in quantum mechanics): The specific parameters or configurations an experimenter chooses when conducting an experiment, such as which direction to measure a particle's spin.

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