Sometimes, authors wish to release a lower quality or lower resolution version of an image or video under a free license, while applying stricter terms to higher quality versions. For digital distribution, use of open file formats free of digital restrictions management ( DRM) may be required.
If you are a re-user looking for information on how to use Commons content in your own work, see Commons:Reusing content outside Wikimedia. It aims to help uploaders decide whether an image or other media file is acceptable on Wikimedia Commons. This page gives non-lawyers an overview of complicated copyright laws through an example-based tutorial.