Terms of Use
How the content here may be used, short version: take the ideas, credit welcome.
Last updated: July 2026
Content licence
The written content on this site is licensed under a Creative Commons Attribution 4.0 International Licence (CC BY 4.0). When you share or build on an idea from The Leman Paradox, appropriate attribution and a link back to the original are appreciated. You don't need to ask permission to build something.
Acceptable use
- Credit the source when you reproduce written content;
- Don't use the content for illegal purposes;
- Don't attempt to breach the site's security.
Intellectual property
- The site's design, branding and original illustrations are our own;
- The concept ideas are shared for inspiration and educational purposes;
- Implementing any shared idea is done at your own risk.
About the names. Every brand name on this site is a working title. They were invented to make an idea easier to talk about, nothing more: no domain is reserved for you, no trademark is cleared, and none of them is being handed over. If you build one of these, pick your own name and check the domain and the trademark before you print anything. Then tell us what you landed on, we like that part.
No warranty
- Ideas and concepts are shared "as is";
- We make no warranty about the success or viability of any idea;
- We are not responsible for losses incurred from implementing a concept.
Changes
We may update these terms at any time; the "last updated" date above reflects the current version.
New files are written to disk regularly.
Get each new concept in your inbox the day it's published. One email, no noise.
Every idea on this site is a complete business concept, free to take. Market, features, flaws: published in full under CC BY 4.0. You read one, you like it, you build it.
Good first reads:
- The Haven ProgramA real-world protection program for people fleeing domestic violence, because the most dangerous moment is the moment they leave.
- ThreatShieldForward a suspicious email, get a risk score back in seconds.
- TuttiA dark stage where every orchestra section glows, and your hands shape how a finished score feels instead of drawing it with a mouse.
Received. Your claim lands on the board after a quick human read, usually within a day or two.
Say it loud, if you like. The card is yours too:
20 image(s). Original cover artwork from an earlier era of the catalogue. The site moved on to its window-and-emoji vignettes; these stay here, because they were made with care.
All illustrations are original works by Maryna Lagereva. Double-click any picture to view it full size.
- Take an idea. Everything on this machine is published under CC BY 4.0: complete, free, no strings. You do not need my permission, my blessing, or my email to start.
- Tell me anyway. The "I'm building this" buttons open a thirty-second form (a short email works too), at either moment: when you start or when you ship. Name or alias, a link if you have one, one line about the project.
- Get listed. Your project goes on the board and on the idea's own page, with a link, for as long as this site exists. Launched projects take the top spot in their idea's history.
The assistant files every entry. He is very thorough. Buttons not working? Write to hello@thelemanparadox.com.
Good day. I maintain this system. Would you like a short tour?