Privacy policy

Updated 29 October 2026 · Operator: 广州市增城落印软件开发工作室（个体工商户） · This is a translation; if it differs from the Chinese version, the Chinese version applies.

This explains what information this website (luoyinsoft.com) and our apps (Luoyin and Tuowen) come into contact with, and what it is used for.

1. The apps

Our apps do all their processing on your computer. They never upload your files, seal images, sealing history or conversion results, and they do not connect to the internet. License keys and trial periods are checked offline. Apps whose keys are bound to a computer (such as Tuowen) derive a machine code from the operating system’s machine identifier and show it to you; we only learn it when you enter it on this website to claim a key.

2. When you buy

To issue your license key and send it to you, we record: the licensee’s name (a person’s or an organisation’s), your e-mail address, the product, plan and amount, the order number, the transaction number and payment time reported by the payment platform, the IP address the order came from (to prevent abuse), and the machine code where one is needed.

You pay on the payment platform (such as Alipay). We never see or keep your bank card, payment account or password.

3. When you send feedback

The description, contact details and attachment you give on the feedback page are used only to look into that problem and improve the apps. Attachments (feedback folders, sample files) are stored on our server, never published or passed on, and deleted once the problem is dealt with.

4. What it is used for

Only to issue your license key and e-mail it to you, to send keys again when you ask, to move a seat to another computer, for support, refunds and invoices, and to keep transaction records as the law requires. We do not send marketing e-mail, and we never sell or give this information to anyone else.

5. Service providers

E-mail is sent through a cloud provider’s mail service and payments go through Alipay; each gets only what it needs to provide its service.

6. How long it is kept

Order information is kept as long as the law requires for transaction records (at least three years from the transaction), then deleted or anonymised. Feedback attachments are deleted once dealt with, and after 90 days at the latest.

7. Cookies

This website uses no cookies, and no third-party analytics or advertising code.

8. Your rights

Write to gouqingyu@163.com to see, correct or delete your information (apart from transaction records the law requires us to keep). We reply within 15 working days.