Feature summary (what you would like to be able to do and where):

In Commons, provide a way to combine the image with the QR for image credit purpose.

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):

Problem: Many times, people uses images from Commons without proper attribution. Although it's fine for several licenses such as PD images, but not okay for CC images.

Solution: QR code can be handy for this. Provide automatically QR code for the file in the bottom right of the image. Thus when the image is used by third party, it automatically contain the link for the full credit information. Right now, this is doable by downloading the images and QR separately, and then combine it using image editor.

Alternative: Of course people can choose to download the image without QR code, or the QR code in different location (bottom left, top right, etc.)

I think this is only doable for images (for starters), and harder for other file types, such as pdf, videos, audios, 3d files, etc.

Benefits (why should this be implemented?):

• Correctly provide link to author and license information, as deemed necessary by the CC licenses
• Promote the QR functionality to wider audience
• Avoid extra manual work by people who want to do so

Drawbacks:

• Distractions: Adding extra elements to the image (i.e. derivatives, which technically is allowed by the Commons licenses)
• Might cover some important part of the image, thus must provide alternative placements (i.e. default on bottom right, but available in other corners as well)
• How big / how small should it be? Would it be legible if its too small? For which image resolution should it be provided? And a host of other technical issues like hosting, rendering, etc. But I think it should be done on the fly, and not stored as separate files.
• Gadget or core MediaWiki? I think this feature should be enabled by default for non-logged in users, because the target users are the non-initiates / non Wikimedian who won't bother to activate any gadgets in preference (which means have to create account / login etc.). Alternatively, provide a way for logged-in users to disable this feature.