K-12 license is our discounted plan solely for teaching students under the age of 18 as private tutor, homeschool teacher or accredited public or private primary or secondary school teacher. Use in a corporate, university or adult education is not permitted. School email is required at time of purchase to show affiliation and automated approval. If you do not have a school-issued email address or your email address cannot be verified, additional proof of eligibility will be requested after purchase.