An open license is a standing permission. Instead of asking each person who wants to use a work to contact the owner, the owner publishes terms in advance that say what anyone may do, and under what conditions. This makes sharing and reuse far easier, but “open” does not mean “no rules.” This article explains the general idea, not the law of any particular country, and it is not legal advice. The text of the license you are using is always the final authority.
How an open license works
Copyright, by default, reserves most uses of a work to its owner. A license is the owner’s way of granting some of those uses to others. An open license grants them broadly, to the public, usually without payment, as long as the user follows the stated conditions.
The owner keeps the copyright. Using a work under an open license is not the same as owning it, and the grant only covers what the license says. If you do not meet the conditions, you may be outside the permission, which can leave you in the same position as someone who never had permission at all.
Common conditions
Open licenses differ, but several conditions appear again and again. Some well-known license families, such as those published by the Creative Commons organization, combine them in a standard way, which makes them easier to recognize. The usual building blocks are:
- Attribution: you must credit the creator, and often provide a link to the license or the original, and note whether you changed anything.
- Share-alike: if you adapt the work, you must release your adaptation under the same or a compatible license.
- Non-commercial: you may use the work only for purposes that are not primarily commercial. What counts as commercial can be debated, so read the license and any official explanation carefully.
- No derivatives: you may share the work as it is, but not alter or build on it.
Some creators release work with essentially no conditions, for example through a public domain dedication, which waives rights as far as the law permits. These dedications are also described in license texts, and the details vary by country.
Not every “free” resource is openly licensed. A site may say images are free to view or download while still limiting what you may do with them. Always look for the actual license statement, and be wary of a page that offers no clear terms.
Why proper attribution matters
Attribution is not a formality. In many open licenses it is the central condition, and failing to meet it can mean you are no longer licensed. Beyond that, it is how creators who share generously get something back: recognition, a path for people to find more of their work, and a reason to keep sharing.
A good attribution usually names the title of the work, the creator, the source, and the license, with a link to the license text where possible. Follow whatever the specific license asks for. If it requires you to indicate changes, such as cropping an image or trimming audio, say so plainly. Practical habits for this are covered in more depth when thinking about how to give a source credit that is complete and fair.
Reading the terms before you reuse
A short checklist helps before you use any openly licensed work:
- Find the license statement on the original page, and confirm it applies to the exact work, not just to the site in general.
- Identify the conditions: attribution, share-alike, non-commercial, no derivatives.
- Check that your intended use fits, for example whether you plan to edit the work or use it in something commercial.
- Note the details you need for the credit, and save a copy of the license information with the date you accessed it.
- Look for exceptions. A work may include parts owned by someone else, such as a logo, an artwork or a person’s personal likeness, that the license does not cover. Where people appear, consider whether you also need their consent to feature them, since privacy and publicity rules sit apart from copyright.
Mixing licensed work
When you combine several works, the licenses must be compatible with each other and with your plans. A share-alike condition on one element can affect how you may release the finished piece, and a no-derivatives or non-commercial condition may rule out certain uses altogether. If compatibility is unclear, choose another element or ask the owner directly.
Choosing an open license for your own work
If you want others to reuse what you make, an open license can state that clearly. Think about what you actually want. Do you want credit? Do you want adaptations to stay open? Are you comfortable with commercial reuse? Choose a license that matches those answers, state it visibly beside the work, and use the exact name and version of the license. Releasing a work under an open license is generally hard to take back for copies already shared, so decide carefully.
Licenses and web pages can change, so keep a dated note of the work, its creator and the license at the time you used it.
For specifics about a particular license, rely on the license’s own text and the official explanations published by the organization behind it, and consult a qualified professional if a decision carries real consequences.