Is there any case law or precedent for impeding on privilege?

Ontario, Canada

The following excerpt is from Marshall, et al. v. Jackson, et al., 2021 ONSC 8025 (CanLII):

Yet the issue of privilege is obviously a very important consideration in this matter. In Brewer v. Royal College of Dental Surgeons of Ontario, et al., 2021 ONSC 5697, I discuss both solicitor-client and litigation privilege in some detail. Clearly, impeding on privilege is only to be done with much caution, and only where doing so is necessary in the interests of justice. Thus, I consider whether such is necessary to be done in this matter.

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