License clarification

[johan-moberg]

Hi Lucide team

First of all, thanks for the great work on Lucide, it’s a fantastic resource.

I’m looking for some clarification regarding the ISC license (and the included MIT-licensed Feather icons), specifically around how the copyright and license notice requirements should be interpreted in practical use cases.

From the license text:

“provided that the above copyright notice and this permission notice appear in all copies”

My understanding is that this requirement applies when redistributing the software itself (e.g. the icon set, SVG files, or a library/package containing them), rather than when using the icons as part of a design or end product.

However, there seems to be some uncertainty internally in our organization, so I’d really appreciate your guidance on how you intend this to be interpreted.

Concretely, I’d love clarification on these scenarios:

1. Using icons in a website UI

   • Do we need to include copyright/license text anywhere (e.g. footer, /licenses page)?
   • If yes, do we need to include copyright/license text on every page where we use the icons? or is it enough in a single page like a policy page or something like that?

2. Using icons in marketing materials

   • Examples: brochures, ads, social media posts
   • Is any attribution or license text required in these contexts?

3. Embedding icons in distributed products

   • For example: a website template, design system, or downloadable asset
   • Is including the license in documentation or a LICENSE file sufficient?

4. Optional attribution

   • Is attribution appreciated but not required in typical usage?

In short:

Is it correct to interpret the license as:

• No attribution required when icons are used as part of a final design (UI, print, social, etc.)
• License text required only when redistributing the icon files or library itself

Would love to hear how you recommend handling this in practice 🙏

Thanks again!