Privacy Policy

1. Business name and location

KEISEN LLC（合同会社渓僊） Nakamura-ku, Nagoya, Aichi, Japan

Our full address and the name of our representative are available upon request through the contact details in Section 9, and we will respond without delay.

2. Information we collect

We collect the following information to the extent necessary to achieve the purposes of use set out in Section 3:

• Names, organizations, positions, addresses, telephone numbers, and email addresses of individuals involved in inquiries, consultations, and transactions, as well as records of communications and our responses.

• Contact details of individuals involved in the use of our publications, purposes of use, planned periods of use, planned numbers of copies, and related information. For adoption as a textbook, this also includes courses taught, adoption status, and related information.

• Information regarding contracts, orders placed and received, deliveries, invoices, and payments involving authors, editorial contributors, and business partners, as well as bank account details required for payments.

We collect this information from the individuals concerned and through communications relating to contracts and transactions. We may also collect it from the official websites of universities and other institutions, and from other publicly available materials, for communications providing information and seeking confirmation regarding the publication and use of our publications.

Through the Site’s contact form, we collect your name, email address for reply, organization (optional), inquiry topic, and message. We also collect your consent status regarding the handling of the information you enter.

When you browse the Site, access information such as your IP address, browser type, and access date and time may also be recorded for technical purposes by the Site’s delivery infrastructure provider, Cloudflare, Inc.

3. Purposes of use

We use the personal information we collect for the following purposes:

• To respond to inquiries and make necessary contact.

• To respond to consultations regarding publishing, software development, and education and research support.

• To provide information on the release, continued sale, revision, and purchase of our publications, and to confirm their use, planned periods of use, planned numbers of copies, and related matters. This includes providing information and seeking confirmation regarding adoption as textbooks.

• To communicate regarding the production and editing of publications, manage contracts with authors and editorial contributors and permissions to use copyrighted works, and pay royalties, honoraria, and other amounts due.

• To process orders for publications, shipping and delivery, returns, invoicing, payment confirmation, and other transaction-related matters.

• To accept commissions for software development and education and research support, perform contracts, deliver work products, and make necessary contact for maintenance and support.

• To manage contract and transaction records, carry out accounting and tax procedures, and comply with legal requirements.

• To operate the Site safely and maintain its security.

4. Disclosure to third parties

We do not disclose personal information to third parties without the individual’s consent, except as provided by law.

However, we may entrust service providers with the handling of personal information to the extent necessary to achieve the purposes of use. Transfers to providers outside Japan are handled in accordance with Section 5.

5. Outsourcing

We may entrust external service providers with the handling of personal information to the extent necessary for the production and delivery of publications, business communications, information storage and management, accounting, and related activities. When doing so, we select providers appropriately and exercise necessary and appropriate supervision to ensure the security of personal information.

Information submitted through the contact form reaches us via the form submission service Web3Forms, operated by Web3Creative. The Site also operates on the delivery infrastructure of Cloudflare, Inc. We entrust these providers with the handling of information to the extent necessary to provide their services. According to its published materials, Web3Creative, the operator of Web3Forms, is based in India. Information submitted through the form may be stored and processed outside Japan by Web3Creative and the service providers it uses. Information may also be handled outside Japan through Cloudflare, Inc.’s services.

When transferring personal data to providers outside Japan, we take the steps required by applicable law, including providing the required information and obtaining the individual’s consent, or verifying that the recipient maintains the safeguards prescribed by law and taking other necessary measures.

Web3Forms’ published materials state that submitters’ IP addresses and email addresses may be processed by external spam prevention services it uses to prevent spam. The handling of information by each service is set out in the provider’s terms of service, privacy policy, and related documents.

6. Cookies and related technologies

The Site does not use cookies for analytics or advertising. We use a cookie to remember your choice of Japanese or English as the display language. This cookie has a validity period of one year. To select the initial display language, we may also refer to information about the country from which you access the Site and your browser’s language settings. Technical cookies for security purposes may be set by the delivery infrastructure provider.

7. Retention period

We retain personal information only for as long as necessary to achieve the purposes of use and for any period required by law. When retention is no longer necessary, we delete or dispose of the information appropriately.

For contact details and records of communications concerning the use of publications, as well as contract and transaction records involving authors and business partners, we assess the need for retention in light of ongoing communications, contract performance, the management of rights, legal retention obligations, and related considerations.

We delete personal information collected through inquiries after the inquiry has been resolved and the necessary retention period has elapsed. If an inquiry leads to a transaction, however, we retain the information as a contractual record for the period prescribed by law.

For form submission data in Web3Forms, we have set the retention period in the dashboard to seven days. However, we are currently confirming with the service provider when the data is actually deleted from databases, logs, and backups. This setting is separate from the retention period for emails we receive and our records of handling inquiries.

8. Security safeguards

We implement appropriate security safeguards to prevent unauthorized access to, loss of, or leakage of personal information.

For an overview of our security safeguards, please contact us using the details in Section 9. We will respond without delay, except for information whose disclosure could undermine those safeguards.

9. Requests for disclosure correction deletion and other actions

If an individual requests disclosure, correction, suspension of use, deletion, or other action concerning their personal information that we hold, we verify their identity and respond promptly in accordance with the law. Please submit requests, inquiries, and complaints regarding our handling of personal information through the Site’s contact form.

10. Changes to this policy

We may revise this policy in response to changes in legislation or our business activities. Revisions apply from the time they are posted on the Site.