Judgment, decree or order obtained by playing fraud on the Court, Tribunal or Authority is a nullity and non est in the eye of law. Such a judgment, decree or order by the first Court or by the final Court has to be treated as nullity by every Court, superior or inferior. It can be challenged in any court, at any time, in appeal, revision, writ or even in collateral proceedings.

A.V.Papayya Sastry & others v. Government of A.P. & others AIR 2007 SC 1546 2007 AIR SCW 2212 2007 (4) SCC 221 2007-4-L.W.139 at page 150 wherein in paragraph 21,23,24,25 it is held as follows: 'It is thus settled proposition of law that a judgment, decree or order obtained by playing fraud on the Court, Tribunal or Authority is a nullity and non est in the eye of law. Such a judgment, decree or order by the first Court or by the final Court has to be treated as nullity by every Court, superior or inferior. It can be challenged in any court, at any time, in appeal, revision, writ or even in collateral proceedings.