Project Euclid is committed to protecting your privacy.

Personal information that we may collect

Users of https://projecteuclid.org may be requested to provide personally identifiable information, including

  • your name, address, email address, institutional affiliation, and telephone number
  • account credentials, such as username and password (Euclid staff cannot access passwords)
  • communications preferences, such as signing up to receive new publication email alerts

In our automated systems, we make efforts to collect only data that is necessary for Project Euclid to conduct business and improve user experience of our site. We may use analytics tools to help us understand aggregate user behaviors by collecting IP addresses, device and software identifiers, referring and exit URLs, onsite behavior and usage information, purchase history, and other similar information.

How we collect your information

Individual users are required to provide their names and email addresses and create a password if they choose to create an account. Entering other information is optional. A user must create an account to register for individual subscription access to a publication, sign up for email alerts, save searches, or manage research via My Library. An account is not necessary for other interactions with the Project Euclid website, including access to available content hosted by Project Euclid.

Project Euclid collects institutional account information, including IP (internet protocol) address ranges, publication entitlements, and administrative contact name and email address. The information is either provided to Project Euclid directly by the librarian account administrator or by a publisher who has collected the information from its institutional customer in order to fulfill an order or request.

Our website uses cookies, small data files placed on your device, to support some features. This is a common practice for websites across the internet, but if you would prefer that we not use cookies, you can set your browser to reject them. Disabling cookies on Project Euclid would disrupt a user’s ability to log in as an individual or library account holder, access individual subscriptions, or access pay-per-view purchases. Our site also uses cookies to accurately measure and report on usage for libraries.

How we use your information

The information that you supply to Project Euclid will be used to verify your identity, confirm your content access, and provide services you explicitly request. It may be used to improve our response to customer service requests or enhance the services that we provide.

How we share your information

Project Euclid may reveal personally identifiable information about you to third parties in order to facilitate a transaction that you have authorized; to comply with the law; to fulfill valid business needs in cooperation with our vendors, service providers, or agents (e.g., analyzing data, providing marketing assistance, processing orders, etc.).

Access to personal data is restricted to personnel who have a valid business reason for their access. Information may be made available to the publishers of the journals and monographs to which you or your institution subscribe.

External websites

The Project Euclid website contains links to third-party websites. Project Euclid is not responsible for the content on third-party sites or for their use of personal information.

How we protect your information

Project Euclid uses TLS/SSL (i.e., HTTPS) to provide data security and integrity throughout our site. Project Euclid never stores credit card numbers and will never ask you to supply credit card information over email or any other insecure method.

To delete your account or change your preferences

If you sign up to receive email alerts from Project Euclid, you may use the links at the bottom of any email that you receive from us to opt out at any time or to change your preferences.

Unless you instruct us otherwise, you may, very occasionally, be included on a mailing list about a topic that we have reason to believe is related to your interests. If you do not want to receive any mailings from Project Euclid, please contact us to let us know.

To delete your account or submit any special requests or questions related to personal information and privacy, please contact us.

Special notice for EU residents

If you are located within the European Economic Area, please see the chart below for more information about our privacy practices as is required by the General Data Protection Regulation (GDPR). Project Euclid collects and maintains personal information about site users and purchasers of items to facilitate purchases and respond to your comments and questions. We may also use your information to keep you informed about Project Euclid products that we think may interest you. Please contact gdpr@projecteuclid.org with any questions, concerns, or requests.

Contact Information
including your name, home address, email address, and phone number
To provide confirmations of transactions, respond to requests for information from you, and provide you with information regarding Project Euclid events and initiatives; to respond to records requests
  • To process transactions requested by you and meet our contractual obligations
  • Legitimate interests
  • Your consent, if applicable
Payment Information
including your payment card number
To process your transactions
  • To process transactions requested by you and meet our contractual obligations
  • Legitimate interests
  • Your consent, if applicable


Reasonable Use of Content Statement

Reasonable use of online journal, book, and proceedings content within Project Euclid allows users with appropriate access rights (see Subscriptions and Access) to view, download, save, and print full-text articles for personal use.

Regardless of an individual's access rights to content within this system, Project Euclid prohibits unreasonable use of any content. This prohibition applies to open access journals and books as well as content accessible only to subscribers. Unreasonable use includes but is not limited to (i) fee-for-service use of copies, (ii) the sale of copies, (iii) the systematic reproduction and distribution of copies to other persons, (iv) the bulk reproduction of content, including any systematic, automatic, or bulk downloads of full-text documents, or (v) the bulk distribution of copies to other persons.

Project Euclid reserves the right to deny access to any user who engages in unreasonable use of content.

If you believe you have been denied access because of this policy, and you wish access restored, please contact Project Euclid.

Users should also be aware that materials made available within Project Euclid are likely subject to additional restrictions placed on them by the copyright owner.


Project Euclid is committed to making its website available to as many users as possible, whichever platform or device they may be using. We are currently assessing our level of compliance with accepted accessibility guidelines. At a minimum, Project Euclid aims to achieve the "Double-A" standard of the W3C Web Content Accessibility Guidelines 2.1, as well as meet all the website accessibility guidelines of Section 508 of the US Rehabilitation Act (1194.22).

VPAT (Voluntary Product Accessibility Template)

Download the Project Euclid VPAT for detailed information about the platform's conformance to accessibility standards.

If you find something on our website that is not accessible, please contact Project Euclid and describe the problem.


Some publishers sell individual articles on a pay-per-view basis. Where available, a user can click the "Buy Article" button on the article abstract page, provide credit card information, and receive access to download the article once the payment is confirmed. Downloadable articles are non-refundable. Your purchased article will continue to be available to your account under Access & Downloads for one year following purchase. 

If you have any questions about pay-per-view, please contact Project Euclid.

Security, Disaster Mitigation and Recovery

The proposed Euclid Digital Library will operate on hardware, software, and services managed in concert with SPIE's computing infrastructure. This design leverages the SPIE's expertise in infrastructure design, resiliency, and security best practices. 

The network architecture is designed with multiple layers of security services and fault tolerance. Server-based security measures, such as encryption, role-based security, patch management, and server hardening are complemented by more complex systems. these systems include next-generation firewall security with deep packet inspection and web application firewalls. This security stack complements a robust content delievery network, global load-balancing, distributed denial of service attack protection, and other security services. 

SPIE maintains and operates a disaster recovery warm site with production-level hardware and software. This disaster recovery site operates in a geographically seprate region from our primary data center and is kept up to date with ongoing data and content synchronization, typically with 15-minute recency. Failover tests are conducted annually to ensure readiness and availability. 


Project Euclid also provides technical support to those publishers who wish to participate with the preservation services CLOCKSS and Portico. Participation with these services requires an agreement with the copyright owner and is thus a decision of the publisher.

Best Practices

Project Euclid endorses the publishing recommendations developed by the International Mathematical Union's Committee for Electronic Information Communication (CEIC). Please see the latest recommendations on the CEIC website.

We also endorse the guidelines published by the Committee on Publication Ethics (COPE).

Project Euclid policy regarding retractions and corrections

According to COPE’s Retraction Guidelines:

  • Retraction is a mechanism for correcting the literature and alerting readers to publications that contain such seriously flawed or erroneous data that their findings and conclusions cannot be relied upon. Unreliable data may result from honest error or from research misconduct.
  • Retractions are also used to alert readers to cases of redundant publication (i.e. when authors present the same data in several publications), plagiarism, and failure to disclose a major competing interest likely to influence interpretations or recommendations.
  • The main purpose of retractions is to correct the literature and ensure its integrity rather than to punish authors who misbehave.

Once an article has appeared on the Project Euclid website, it should remain publicly accessible. This is true not only for articles in regular journal issues but also articles or chapters published online only or in some form of ahead-of-print publication.

On Project Euclid, there are multiple tools available to publishers for displaying corrections or linking articles and their errata. The best approach can depend on context, so we suggest that publishers please contact Project Euclid if they need to issue a correction.

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