Included in your bursar bill. Do not buy this. 1. Access: automatic in Canvas on day one. 2. Billing: charged to your bursar account. 3. Action needed: none — buying a copy elsewhere means paying twice. 4. The opt-out period ends the same day as "No Reduction of Charges on Dropped Courses after this Date" on the Academic Calendar. Check https://www.ou.edu/registrar/academic-records/academic-calendars for the specific date of your term.
