Mont. Code § 25-9-105
Any judgment or decree of any court of this state affecting real property, provided that no action is now pending to set aside any such judgment or decree, which was, prior to January 1, 1973, copied into the proper book kept in the office of the clerk of the district court, and certified copy of which judgment or decree was, previous to July 1, 1973, recorded in the proper book kept in the office of the county clerk and recorder shall be deemed to impart, after that date, notice of its contents to subsequent purchasers and encumbrancers, notwithstanding any defect, omission, informality, or irregularity in any of the court proceedings in the action in which such judgment or decree was entered and obtained, if time for appeal in the case has expired; and such judgment or decree shall not be deemed invalidated by reason of any such defect, omission, informality, or irregularity; but nothing herein shall be deemed to affect the rights of purchasers or encumbrancers previous to that date. Duly certified copies of such judgment or decree or of the record thereof may be read in evidence with like effect as copies of a judgment or decree duly and regularly obtained and recorded and entered.
§ 25-9-105, MCA