A typical Turnitin instructor account allows a class to have up to 150–200 students (depending on the license). Even if an instructor were criminally negligent and allowed strangers to join, the class would fill up within hours of posting the key online.
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Searching for a "free exclusive" enrollment key is a common endeavor for students looking to verify their work before a final submission. However, our review of available information shows that Turnitin does not provide individual accounts or public keys; access is strictly managed through institutional licenses. Understanding Turnitin Access turnitin class id and enrollment key free exclusive