Without Prejudice” settlement communications can be relied to enforce settlement as set out in leading Alberta Court of Appeal case, Bellatrix Exploration Ltd. v. Penn West Petroleum Ltd., 2013 ABCA 10:
Exceptions to Settlement Privilege
 As with most forms of privilege, there are exceptions to the rule. Some are universally accepted, while others are more controversial. Among the generally recognized exceptions are the following:
(a) to prevent double recovery: Dos Santos (Committee of) v Sun Life Assurance Co of Canada, 2005 BCCA 4 (CanLII), 207 BCAC 54;
(b) where the communications are unlawful, containing for example, threats or fraud;
(c) to prove that a settlement (an accord and satisfaction) was reached, or to determine the exact terms of the settlement: Comrie v Comrie,2001 SKCA 33 (CanLII), 203 Sask R 164;
(d) it is possible that the settlement posture of the parties can be relevant to costs. That is clearly the case with offers made under the Rules of Court, but also with respect to informal offers: Mahe v Boulianne, 2010 ABCA 74 (CanLII) at paras 8 ‑ 10, 21 Alta LR (5th) 277; Calderbank v Calderbank,  3 All ER 333 (CA).
Jenna is an Associate with Rowanoak Law Office LLP.