# Attribution Reminder under CC-BY-4 for ECMWF Products from the Real-time Catalogue

**URL:** <https://forum.ecmwf.int/t/attribution-reminder-under-cc-by-4-for-ecmwf-products-from-the-real-time-catalogue/14480>\
**Category:** Announcements\
**Tags:** ecmwf-updates, licence\
**Created:** [5 December 2025 09:25 UTC](https://forum.ecmwf.int/t/attribution-reminder-under-cc-by-4-for-ecmwf-products-from-the-real-time-catalogue/14480 "2025-12-05T09:25:17Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Michela](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/m/898d66/32.png) [@Michela](https://forum.ecmwf.int/u/Michela)\
**Post date:** [5 December 2025 09:25 UTC](https://forum.ecmwf.int/t/attribution-reminder-under-cc-by-4-for-ecmwf-products-from-the-real-time-catalogue/14480/1 "2025-12-05T09:25:17Z")

</div>

We would like to inform users that all ECMWF Products from the **[Real-time Catalogue](https://products.ecmwf.int/shopping-cart/orders/new)** now fall under the CC-BY-4 licence.  
A clear attribution is legally required when using or sharing the data, whether accessed from our free data portal, via a Service Agreement, or from a third party.

Guidelines for attributing and citing ECMWF Products can be found here: **[Attributing and citing ECMWF data](https://confluence.ecmwf.int/display/DAC/Attributing+and+citing+ECMWF+data)**

A recommended format for the attribution is:

_ECMWF IFS Forecast data, accessed from ECMWF’s MARS archive, © European Centre for Medium-Range Weather Forecasts (ECMWF), 2025. Licensed under CC-BY-4.0._

**Please also note** that users who redistribute or broker ECMWF Products are responsible for assisting users who access data via their services.

For any questions, please reach out to us via the **[ECMWF Support Portal](https://confluence.ecmwf.int/category/cd)**.

ECMWF Support