Copyright & DMCA

Ownership of website content

Unless a separate credit or licence states otherwise, the original text, illustrations, design and code on Abaca Digital are owned by or licensed to Abaca Digital, to the extent protected by applicable law. Third-party materials remain subject to their owners' rights and any accompanying licence conditions.

We do not claim ownership of mathematical facts, standard formulas, public-domain works or other material that is not protected by copyright. A particular explanation, illustration or software implementation of a formula may have its own protection.

Using and sharing our content

You may use our calculators for personal, non-commercial purposes under our Terms and Conditions. You are welcome to share links to our pages so that others can use the tools and read the explanations in context.

For permission to republish an article, reproduce an illustration, embed a calculator or incorporate our code into another product, please contact us with the page URL and a description of the intended use. A credit or link does not, by itself, replace permission where permission is required.

Nothing in this policy limits uses permitted by applicable law, including fair use, fair dealing and quotation exceptions, or permissions granted under a separate licence.

Third-party images and other materials

Where an image or other item carries a source credit or licence notice, check those details before reusing it. Our permission cannot extend to rights held by someone else. If you believe a credit is missing, a licence has been applied incorrectly or an item has been used without permission, please identify the item when contacting us.

Reporting a copyright concern

Please use our contact form and begin your message with “Copyright concern”. To help us investigate, include:

• Your name and contact details, and whether you are the rights holder or an authorised representative.
• A description of the original work, with a source URL or other information identifying it.
• The exact URL on Abaca Digital and the specific text, image or other material you are reporting.
• An explanation of why you believe the use is unauthorised, including any relevant licence details.

We will review the information and may ask for clarification. Depending on the findings, we may remove or restrict access to material, correct an attribution, or explain the basis for its use. Sending a report does not automatically establish that infringement has occurred.

Please provide only information relevant to the report. See our Privacy Policy for information about contacting us.

About formal DMCA notices

The Digital Millennium Copyright Act (DMCA) provides a United States notice-and-takedown process in circumstances covered by that law. A formal notice generally requires:

• A physical or electronic signature of the copyright owner or an authorised representative.
• Identification of the copyrighted work and the allegedly infringing material, with enough information to locate it.
• Contact information, including an address, telephone number and email address if available.
• A statement of good-faith belief that the disputed use is not authorised by the owner, its agent or the law.
• A statement that the information is accurate and, under penalty of perjury, that the sender is authorised to act for the owner of the exclusive right involved.

The contact form above is a channel for copyright enquiries; this page does not identify it as a registered DMCA designated agent or claim statutory safe-harbour protection. For formal notice requirements, designated-agent information and counter-notification procedures, consult the U.S. Copyright Office's Section 512 guidance. Applicable rights and procedures depend on the circumstances and jurisdiction.

Questions and updates

If you believe a removal or attribution decision was mistaken, contact us with the relevant URL and evidence of ownership, permission or another lawful basis for use. We may revise this policy as our website changes; the date above records the latest revision.