Privacy policy

Policy version: 2026-09-27-r2

We collect your name, email address, authentication records, contributions, download grants, credit transactions, and security audit records to operate this service.

How your information is used

Your email is used for verification, password recovery and account support, and is never displayed in the public catalogue. Uploads remain private during review. Approved listing details and previews are public; members download reviewed files. Complete original uploads remain restricted to our team, while you can view your own upload record.

Contact messages and reply details are used by our team to handle your enquiry. Copyright complaints and responses may need to be shared to resolve a dispute, as explained in our Copyright & takedown policy. Avoid sending unrelated sensitive information.

Storage and retention

Accounts, contributions and audit records remain while needed for service integrity and dispute resolution. Expired sessions and verification tokens are cleaned automatically. Original uploads and processing history are kept in restricted storage for review and record integrity; creating a public copy does not delete the original. Contact us to request access, correction or account closure; credit and security records may be retained when necessary to investigate abuse.

Your account and data

You can change your name, email and password, or request account closure in Account settings. Your account will be deleted within 7 days of your closure request. Your personal account details and private practice history will be deleted; published papers remain available.

Account settings · Contact support

For access to or correction of personal records, use the options below or contact support. Guest exchange rooms use separate browser cookies; contact support about their records.

Practice AI conversations

Guest practice uses a browser cookie lasting 30 days for your private progress and AI conversations. Daily guest practice and AI tutor allowances are shared by visitors using the same network. Clearing cookies or using private browsing does not reset the network allowance. We use a keyed hash that changes each day to count network usage, without storing the raw IP address for these quotas. Old network counting records are cleared during routine cleanup. People on shared school or home Wi-Fi share the guest allowance; sign in for your own quota. Switching networks or using a VPN can still obtain another network allowance. Clearing cookies makes your earlier guest history inaccessible. Backup copies follow the normal backup schedule.

Practice AI chats are stored with your account and the related question. The site operator's local model processes the question, its approved diagrams and your chat messages. Our team may review conversations to check quality and handle abuse. Deleting a conversation removes its text and pending replies from your history and our review records. Content-free security records may remain; backup copies expire under the normal backup schedule. Do not include personal or confidential information in messages.

Private paper exchange

Papers uploaded in a private exchange room are shown only to you and the other person in that room, and are never published on the site. Paper Commons stores these uploads and the name you enter. Our team may review them to deal with abuse or inappropriate files. Each room uses an essential cookie that lets your browser back into the room.

Cookies and service providers

We use essential secure session cookies. Hosting, private storage, and email providers process data to deliver the service. We do not sell personal information or use advertising trackers.

For privacy enquiries, email[email protected]. Avoid uploading personal data belonging to students or teachers.