Analysis of information sources in references of the Wikipedia article "काफ़ि़र" in Hindi language version.
Kufr: Unbelief; non-Muslim belief (Kāfir = a non-Muslim, one who has received no Dispensation or Book; Kuffār plural of Kāfir).
To begin with, there was no forced conversion, no choice between "Islam and the Sword". Islamic law, following a clear Quranic principle (2:256), prohibited any such things [...] although there have been instances of forced conversion in Islamic history, these have been exceptional.