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Creative Commons Licenses Explained A Complete Practical Guide for Digital Content
By Mark Levin · June 29, 2026
Every work in this library carries a Creative Commons license — and understanding what those licenses actually mean is the difference between using a work confidently and accidentally infringing someone's rights. Creative Commons (CC) licenses are standardized, free-to-use public copyright licenses that let a creator keep their copyright while granting everyone permission to share, and often adapt, their work under clear conditions. They are the legal backbone of the open-content movement, used by Wikipedia, the Met Museum, governments, universities and millions of individual creators.
This guide breaks down the full suite of licenses, the four building blocks they are made from, how to attribute a work properly, and how to pick the right license for your own material.
The four license elements
Every Creative Commons license is assembled from a small set of conditions. Learn these four icons and you can read any CC license at a glance:
BY (Attribution) — You must credit the original creator. Since 2004, every current CC license includes this element.
SA (ShareAlike) — If you adapt the work, you must release your version under the same license.
NC (NonCommercial) — You may use the work only for non-commercial purposes.
ND (NoDerivatives) — You may share the work, but not publish modified versions of it.
Mix these conditions together and you get the six licenses below.
The six Creative Commons licenses, from most open to most restrictive
CC BY (Attribution) — Use, adapt and build upon the work, even commercially, as long as you credit the creator. The most permissive license.
CC BY-SA (Attribution-ShareAlike) — Same freedoms as CC BY, but adaptations must carry the same license. This is the license Wikipedia uses.
CC BY-NC (Attribution-NonCommercial) — Adapt and share, but for non-commercial purposes only.
CC BY-ND (Attribution-NoDerivatives) — Reuse and share the whole, unchanged work, including commercially, but no modified versions.
CC BY-NC-SA (Attribution-NonCommercial-ShareAlike) — Non-commercial use only, adaptations allowed under the same license.
CC BY-NC-ND (Attribution-NonCommercial-NoDerivatives) — The most restrictive: share the unchanged work for non-commercial purposes only, with credit.
A useful distinction: only CC BY and CC BY-SA are formally "Approved for Free Cultural Works." The NC and ND licenses are still open and valuable, but they place real limits on reuse — important to know if your goal is the widest possible circulation.
CC0 and the public domain tools
Beyond the six licenses sit two tools for works without restrictions:
CC0 (No Rights Reserved) lets a creator waive their copyright entirely and place a work as close to the public domain as the law allows. Unlike the licenses above, CC0 requires no attribution.
The Public Domain Mark labels works whose copyright has already expired, so reusers know they are free to use.
Why version 4.0 matters
The current generation of licenses is version 4.0, released on 25 November 2013. It was designed as a single, global license that works across jurisdictions without the country-specific "ports" earlier versions needed. One practical change worth noting: from 4.0 onward, you are no longer required to include the work's title in your attribution — though Creative Commons still encourages it where a title exists.
A key point that surprises many people: CC licenses are irrevocable. Once you release a work under a CC license and someone relies on it, you cannot retract that permission for copies already shared. Choose deliberately.
How to attribute a work correctly: the TASL framework
Attribution is the one obligation common to every license except CC0. Creative Commons recommends the mnemonic TASL:
T — Title: the work's title, if one is given.
A — Author: the name of the creator (or whoever they ask to be credited).
S — Source: a link back to the original work.
L — License: name the license and link to its deed (for example, "CC BY 4.0").
A clean example: "Mountain Dawn" by Jane Doe, source, licensed under CC BY 4.0. Each element ideally hyperlinked. Good attribution is not just a legal requirement — it is how the open ecosystem sustains itself, sending credit and traffic back to creators.
How to choose a license for your own work
If you are releasing your own content, work backward from how freely you want it to travel:
Want maximum reach and reuse, including commercial and in education? Choose CC BY.
Want your openness to "stick" to every adaptation? Choose CC BY-SA.
Want to rule out commercial exploitation? Add NC.
Want your work shared intact, never altered? Add ND.
Creative Commons provides a free, official License Chooser that walks you through these questions and generates the correct license code, including the machine-readable metadata that helps search engines and platforms recognise your terms.
Related reading: What the Public Domain Means and Why It Matters in 2026.
➡️ Browse this library filtered by license to see each one in practice.
A note on the road ahead
Open licensing is entering a period of fresh debate, particularly around how openly licensed works are used to train artificial-intelligence systems. Creative Commons itself has been actively exploring ways for creators to signal their preferences in that context. The licenses remain the clearest, most widely understood way to say exactly how your work may be reused — and that clarity is only becoming more valuable.