What is the implied undertaking as a legal obligation to the court?

Alberta, Canada

The following excerpt is from Alberta Treasury Branches v. Leahy, 2000 ABQB 575 (CanLII):

The case authority referred to me as the first formulation of the implied undertaking as a legal obligation to the court is Alterskye v. Scott, [1948] 1 All E.R. 469 (Ch.D.) In that case, the defendant had refused to provide a further and better affidavit of production unless he obtained an undertaking by the plaintiff not to use the documents disclosed for any ulterior or collateral purpose.

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