Legal

Terms of Service

Effective July 29, 2026

These Terms of Service (“Terms”) are a binding agreement between you and Hugh Nguyen (an individual), operator of Professor Lockin (“Professor Lockin,” “we,” “us”). By accessing or using Professor Lockin (the “Service”), you agree to these Terms and to our Privacy Policy. If you do not agree, do not use the Service.

1. Eligibility

You must be at least 13 years old to use the Service. By using it, you represent that you meet this requirement and that the information you provide is accurate.

2. Your account

You are responsible for activity under your account and for keeping access to your email (used for passwordless sign-in) secure. Your chosen username is shown publicly on decks you publish. Notify us promptly of any unauthorized use.

3. Your content

You retain ownership of the decks and flashcards you create (“Your Content”). You grant us a worldwide, non-exclusive, royalty-free license to host, store, display, and — only if you choose to publish a deck — distribute Your Content for the purpose of operating the Service. You are responsible for Your Content and represent that you have the rights to it (including any images you link to) and that it does not infringe others’ rights or violate these Terms.

4. Acceptable use

You agree not to:

• break the law, infringe intellectual property, or post unlawful, harmful, or hateful content;
• upload malware, attempt to breach security, scrape, or probe/abuse the Service or its rate limits;
• resell, redistribute, or share access to paid guides;
• impersonate others or misuse another person’s account; or
• use the Service to store or share others’ personal data without permission.

Classes (teachers & students)

• If you join a class, you consent to share your study progress with that class’s teacher: the assigned decks you’ve mastered, your streak, XP, and when you were last active. Your individual answers and private ratings are never shared. You may leave a class at any timeto stop sharing.
• If you create a class, you are responsible for the people you invite and must use their progress data only for legitimate educational purposes with their agreement — never for anything else. Classes are intended for a teacher/tutor and their own students; institutional or school use may require additional agreements (e.g. FERPA / a data-processing agreement) and verifiable authority over the students’ data.
• We may remove classes, content, or accounts that misuse the feature.

5. Official guides, community guides & intellectual property

The Service, including our official study guides, courses, text, design, and software, is owned by us or our licensors and is protected by intellectual property laws. When you purchase a guide, we grant you a personal, non-exclusive, non-transferable, revocable license to access it for your own study. You may not copy, redistribute, resell, publicly post, or share the paid content.

Community guides are created by independent third-party authors, not by us. Authors own their guides and license them to buyers on the same personal-study terms above. We review community guides before publication and process their sales as merchant of record, but review is not an endorsement and we do not guarantee their accuracy or completeness. Authors are additionally bound by our Author Agreement and Content Policy. If you believe content on the Service infringes your copyright, use our DMCA process.

6. Purchases, pricing & refunds

• Paid guides are sold for a one-time fee (shown at checkout) for lifetime access to that guide, processed by Stripe.
• Prices may change, but changes do not affect guides you already own.
• All sales are final. We do not offer refunds. Purchased guides are digital content delivered immediately upon purchase.
• EU/UK consumers: by completing your purchase you expressly request immediate access to the digital content and acknowledge that you thereby lose any statutory right of withdrawal once access has been provided, to the extent permitted by law.
• Community guides are sold by their authors; we process the payment as merchant of record and handle any refund decision. Displayed prices may have applicable sales tax added at checkout.
• Chargebacks: because digital content is delivered immediately, filing a payment dispute on a purchase you accessed results in revocation of that purchase and suspension of purchasing on your account while we review. Contact us first — we can resolve genuine billing errors directly.
• We may grant complimentary access at our discretion. We are not responsible for taxes you may owe.

Virtual currency & randomized cosmetic items (Gold Stars, Chalk, Study Crates)

• Gold Stars are a virtual currency you can purchase; Chalk is a virtual currency earned free through studying. Both can only be spent inside the Service on cosmetic items — they never affect scores, ranks, leaderboards, or study features.
• Virtual currency and cosmetic items are a limited, revocable, non-transferable license, not property: they have no cash value, cannot be redeemed, refunded, sold, traded, or transferred between accounts, and may be modified or discontinued (with reasonable notice for paid currency).
• Study Crates contain randomized cosmetic items. The exact drop rates for every crate — including mutation odds and modifiers — are published at /crates/odds and rendered live from the same data the drop system uses. Every crate can also be obtained with earned Chalk; paying never changes the odds.
• All Gold Star sales are final (the EU/UK immediate-delivery acknowledgment above applies). If a Gold Star purchase is refunded or disputed, the stars are removed from your balance (which may drop to zero) and purchasing may be suspended per the chargeback clause above.
• Regional availability: purchasing Gold Stars is not available in all locations and may be restricted or disabled based on your region. Earned Chalk and all cosmetic features remain available everywhere.
• Unspent virtual currency is forfeited when your account is deleted or terminated for breach.

Subscriptions & recurring billing (Pro & Dean’s List)

• What they are. Pro and Dean’s List are optional paid subscriptions that add extra AI usage, remove ads, and include cosmetic perks. They never provide any competitive, ranking, or gameplay advantage. All core study features remain free without a subscription.
• Recurring, auto-renewing charge. Subscriptions are billed in advance on a recurring basis (monthly or annual, as you select at checkout) through Stripe. Your subscription automatically renews at the end of each billing period at the then-current price, and your payment method is charged automatically, until you cancel. The price and billing frequency are shown to you before you subscribe.
• Cancel anytime. You can cancel from the billing portal (via your account) at any time. Cancellation stops future renewals; it takes effect at the end of the current billing period, and you keep your subscription benefits until then. We do not provide prorated refunds for the unused portion of a period.
• Refunds. Except where required by law, subscription fees are non-refundable, including for partially used periods and periods in which you did not use the features. EU/UK consumers: by subscribing you request immediate access to the paid features and acknowledge the loss of any statutory withdrawal right once access has begun, to the extent permitted by law.
• Price changes. We may change subscription prices or plan contents. We will give you advance notice, and any change applies to your next renewal — you may cancel before it takes effect if you do not agree.
• Failed payments. If a renewal payment fails, we may retry it and may suspend or downgrade your subscription benefits (returning you to the free tier) until payment succeeds.
• AI usage limits. Each plan includes a monthly allotment of AI usage (credits). Allotments reset each billing month and do not roll over; AI features are also subject to fair-use and anti-abuse limits. AI-generated content may be inaccurate — see the disclaimers below.
• Cosmetic perks. Any cosmetic items granted with a subscription (e.g. a monthly crate) are governed by the virtual-currency terms above (a revocable license, no cash value, non-transferable).
• Applicable taxes may be added at checkout. Chargebacks on a subscription are handled under the chargeback clause above.

7. Third-party services

The Service relies on third parties (such as Stripe, Supabase, and Google sign-in) and may link to third-party content. We are not responsible for those services, and your use of them may be governed by their own terms.

8. Disclaimers

The Service and all content are provided “as is” and “as available,” without warranties of any kind, express or implied, including merchantability, fitness for a particular purpose, and non-infringement. We do not guarantee any particular exam result, score, or outcome. Study materials are aids, not a guarantee of passing any exam, and may contain errors or become outdated.

9. Limitation of liability

To the maximum extent permitted by law, we will not be liable for any indirect, incidental, special, consequential, or punitive damages, or for lost profits, data, or goodwill. Our total liability for any claim relating to the Service will not exceed the greater of the amount you paid us in the twelve (12) months before the claim, or USD $50. Some jurisdictions do not allow these limits, so they may not fully apply to you.

10. Indemnification

You agree to indemnify and hold us harmless from claims arising out of Your Content, your use of the Service, or your violation of these Terms.

11. Termination

You may stop using the Service and delete your account at any time. We may suspend or terminate access if you violate these Terms or to protect the Service. Sections that by their nature should survive termination (e.g., ownership, disclaimers, limitation of liability) will survive.

12. Governing law

These Terms are governed by the laws of the State of Alabama, USA, without regard to conflict-of-laws rules. Subject to Section 13, you agree to the exclusive jurisdiction of the state and federal courts located there.

13. Dispute resolution & class-action waiver

To the extent permitted by law, you and we agree to resolve disputes through binding individual arbitration rather than in court, and you and we waive the right to participate in a class or representative action. This section does not apply where prohibited by law, and does not prevent either party from seeking relief in small-claims court.

14. Changes to these Terms

We may update these Terms. We will post the new effective date here and, for material changes, provide additional notice. Continued use after changes means you accept the updated Terms.

15. Contact

Questions about these Terms? Email ProfessorLockin@gmail.com.