From the August 27, 2021 Academic and Collaborative Technology Memo (see University of Toronto's Plagiarism Detection Tool memo for full version):

After extensive community consultation through a public procurement process, the University of Toronto is pleased to announce that we will be partnering with a company called Ouriginal to be our new provider of a plagiarism detection tool (PDT) beginning September 1, 2021. Ouriginal is a similarity detection solution that combines text-matching with writing-style analysis to promote academic integrity and help prevent plagiarism. The company is based out of Sweden, with more than three decades of experience.

Since the University adopted Quercus in 2017, instructors and students no longer interact directly with a PDT. Instead, they interact with something called the Canvas Plagiarism Framework, which is built directly into the Quercus assignment experience. In this way, the PDT serves more like an behind-the-scenes engine. As a result, adopting Ouriginal as our PDT will not result in any significant changes to the instructor or student workflow. However, the formatting of the similarity report will be slightly different, and support staff will be available to answer any questions instructors may have.

Finally, as part of the community consultation process, it was clear that one of the major considerations for instructors was the ability to check new submissions against previously submitted work for the same course (to prevent ‘hand-me-down’ assignments). Our new PDT will continue to check against previously submitted work, in some cases, going back almost 15 years.