"While this requirement has broader ramifications, one of the aspects of the principle of equality is that no voter will be able to cast more votes than another, nor will citizens be prevented from participating in voting. This means that NVT systems must prevent any person from casting more votes than is established by law and must prevent any votes from being subtracted from the system. (...) At the same time, the principle of equality means that voting should be accessible to all voters, especially for voters living within the country."
OSCE (ODIHR): Handbook for the Observation of New Voting Technologies, p. 10

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Handbook for the Observation of New Voting Technologies