Terms of Use

(Last updated 31-Jan-2016)

1 Acceptance of the Terms of Use

Welcome to Illustrative Mathematics ("we," "us" or "our"). We are very pleased to have you as a user and member of the community. The Privacy Policy and the following terms and conditions (collectively, "Terms of Use") apply to our websites, including but not limited to, and ("Website"). Please read the Terms of Use carefully before accessing the Website. By using the Website, you accept and agree to be bound and abide by the Terms of Use. If you do not agree to be bound by the Terms of Use, promptly leave the Website. If you have any questions or concerns, please contact us. We'll be happy to hear your comments and suggestions.

2 Changes to the Terms of Use and the Website

Illustrative Mathematics reserves the right to amend the Website and the Terms of Use from time to time, at our discretion and without notice. Updated versions of the Terms of Use will appear on this Website and are effective immediately. You are responsible for regularly reviewing the Terms of Use. Your continued use of the Website following the publishing of updated Terms of Use means that you accept and agree to the changes.

3 Accessing the Website, Security and Privacy

We reserve the right at any time and from time to time in our sole discretion to modify or discontinue, temporarily or permanently, the entire Website or some features, with or without notice to users. To access certain features of the Website you must register by entering a username and your email and choosing a password as part of our security procedures. You are responsible and liable for maintaining the confidentiality of your password, not disclosing it to any third party. We provide a "forgot password" procedure in case you forget your password, but you must notify us immediately by email if you believe there has been unauthorized use of your account. We highly recommend choosing a strong password and that you log out from your account at the end of every session. You are responsible and liable for all activities that occur under your account through the use of your password. We reserve the right to disable any user account, at any time in our sole discretion for any or no reason, including but not limited to, if in our opinion you have failed to comply with any provision of the Terms of Use. We do not guarantee that the Website or any content provided on the Website is error free. We manage your personal data according to our Privacy Policy, which is part of these "Terms of Use".

4 Limitations on Use; Online Conduct

You may provide links to this Website, provided that you do not remove any portion of this Website, including the Terms of Use and other notices on this Website, and you immediately deactivate or discontinue providing links to this Website if requested by us.

You agree that you will not post content that infringes a third party’s intellectual property rights, content that defames or harasses others, content that has a political purpose, advertising or other forms of commercial solicitation, or content that otherwise violates federal or state law.

You warrant that you will not post materials that are copyrighted by others if the owner of the materials has not expressly granted to us a royalty-free, perpetual, irrevocable, worldwide, non-exclusive license for said materials with all of the rights granted by you in Section 5 of the Terms of Use.

Although we do not undertake any obligation to review content submitted to the Website, we reserve the right to delete any posting at any time for any reason without permission from you.

5 Submissions

Content on our Website is created, submitted, reviewed, edited and published by members of a community who use the Website. This content is free to the public for noncommercial purposes.

Illustrative Mathematics reserves the right to make and sell products and services that are derivative of, add value to, and/or build upon the content.

You hereby grant to Illustrative Mathematics a royalty-free, perpetual, irrevocable, worldwide, non-exclusive license to use, authorize use of, reproduce, modify, adapt, publish, translate, create derivative works from, combine with other works, distribute, perform, sell and display all content, remarks, suggestions, ideas, graphics, or other information communicated to Illustrative Mathematics through this site, and to incorporate any submission in other works in any form, medium, or technology now known or later developed.

6 Intellectual Property and Attribution

Illustrative Mathematics shall be acknowledged as the owner and/or licensee and developer of the content of the Website, and no claims to the contrary shall be made. Our content is licensed under a Creative Commons Attribution license, abbreviated as CC BY, which allows you to copy, distribute, reuse, adapt, and build upon our work, as long you credit us and indicate if changes were made. Please visit the Creative Commons website to view the license deed and the full legal code. Any use of content of the Website shall include the following notice:

< URL >, accessed on < date >, is licensed by Illustrative Mathematics under CC BY 4.0 where:

  • < URL > is the name of the page containing the Task, Illustration or other content, and contains a hyperlink to the corresponding public page
  • < date > is the date on which the page content was accessed, to determine its version
  • Illustrative Mathematics is hyperlinked to
  • CC BY 4.0 is hyperlinked to

7 Disclaimer of Warranties

Your use of this Website, use of information obtained from the Website and any third-party websites or content therein directly or indirectly accessed through links in this Website is at your sole risk. The Website is provided "as is" and "as available". We expressly disclaim all warranties of any kind, express, implied or statutory, including but not limited to warranties of merchantability, fitness for a particular purpose and non-infringement. We do not warrant and hereby disclaim any warranties, express or implied, with respect to the accuracy, adequacy or completeness of the Website, information obtained from this Website and any third-party websites or content therein directly or indirectly accessed through links in this Website. We do not warrant that the Website will operate in an uninterrupted or error-free manner or that the Website is free of viruses or other harmful components.

8 Limitation of Liability

Under no circumstances and under no legal theory shall we be liable to you or any third party for any loss, injury, claim or damage of any kind resulting from your use of this Website, use of information obtained from the Website and/or any third-party websites or content therein directly or indirectly accessed through links in this Website. We will have no liability for any consequential, direct, indirect, punitive, special or incidental damages of any kind whatsoever, including, without limitation, attorneys’ fees, in any way due to, resulting from, or arising in connection with the use of or inability to use this Website, use of information obtained from the Website and any third-party websites or content therein directly or indirectly accessed through links in this Website.

9 Indemnification

You agree to defend, indemnify and hold us harmless from and against any claims, losses, damages, liability costs and expenses, including but not limited to attorneys’ fees, arising from your violation of the Terms of Use or any third-party's rights.

10 Copyright Infringement and Take Down

If you are a copyright holder who believes that any of the products, services or content which are directly available via the Website are infringing copies of your work, please let us know. Pursuant to The Digital Millennium Copyright Act, 17 United States Code 512(c)(3), a notice of alleged copyright infringement should be sent to Illustrative Mathematics’ designated copyright agent at the following address: Illustrative Mathematics Attn: Legal Department, PO Box 69822, Tucson, AZ 85737-0022 or write to us (Subject: "Legal"). A notification of claimed copyright infringement must be addressed to Illustrative Mathematics’ copyright agent listed above and include the following:

  1. A detailed description of each copyrighted work claimed to have been infringed
  2. A description of where the material believed to be infringed is located on the Illustrative Mathematics Website (please be as detailed as possible and provide a URL to help us locate the material you are reporting)
  3. Your contact information, including your address, telephone number, and email address
  4. Your statement that you have a good-faith belief that use of the work(s) in the manner complained of is not authorized by the copyright owner, its agent, or the law
  5. Your statement, made under penalty of perjury, affirming that the information in the notification is accurate and that you are authorized to act on the copyright owner’s behalf, and
  6. A physical or electronic signature of the owner (or person authorized to act on behalf of the owner) of the copyright that is allegedly infringed

11 Hyperlinking

This Website may include hyperlinks to websites that are not maintained by, or related to, Illustrative Mathematics. We are not responsible for and do not routinely screen, approve, review or endorse the contents of or use of any of the products or services offered by these third-party websites.

12 Assignment

Illustrative Mathematics may assign this Agreement or any part of it without restrictions. You may not assign this Agreement or any part of it to any third party.

13 Entire agreement

The Terms of Use and Privacy Policy incorporate by reference any notices contained on the Website and constitute the entire agreement with respect to access to and use of the Website.

14 Severability

Should for any reason or to any extent any provision of the Terms of Use be held invalid or unenforceable, such invalidity or unenforceability shall not in any manner affect or render invalid or unenforceable the remaining provisions of this Agreement and the application of that provision shall be enforced to the extent permitted by law.

15 Governing Law and Jurisdiction

The terms of use are governed by and construed in accordance with the laws of the State of Arizona, excluding its conflicts of laws provisions, and any action arising out of or relating to these terms shall be filed only in state or federal court located in Pima County, Arizona. You hereby consent and submit to the personal jurisdiction of and exclusive venue in such courts for the purpose of litigating any such action.

Updated 02-Feb-2015

Change log:

02-Feb-2015: First version published