Council of Trent: Session XXIV, Reformation of Marriage, Chapter III

CHAPTER III. The impediment of public honesty is confined within certain limits.

The holy Synod entirely removes the impediment of justice arising from public honesty, whensoever espousals shall be, for whatsoever cause, not valid; but, when they are valid, the impediment shall not extend beyond the first degree; forasmuch as any such prohibition can no longer be observed, without injury, in more remote degrees.

Translation: J. Waterworth, The Canons and Decrees of the Council of Trent (1848), Hanover Historical Texts Project transcription (1995).