To be extremely succinct:
Inspired by this question, I started to think:
How do you attribute and give credit, when you use images and resources that are Creative Commons, copyleft; are in the public domain or have variation of "free" licensing?
(Some of the answers to the above questions grazes that question but it is not really the main issue in that question).
How do you attribute - say -:
(the point here being tiny-weeny images)
For web; there seems to be divided between those who think that in the source code is fine and those who do not. For web you could make a link somewhere discreet that says "credits". This does not really work for print. If you enthusiastically stand on the shoulders of giants, and use what is legally yours to use, your printed leaflet would be bogged down in 6point text attributions.
(Yes, there are differences between countries; I am asking on a general note.)
For a business card, my recommendation would be
If you have room, you might want to include the creator's name as well as the link. You also might want to include the creative commons logo or CC-BY shorthand. It only adds a few characters and checks off another requirement of the licence.
More verbose example:
As others have said, if you're not willing to put minimum credit on the printed product, don't use CC-BY content.
For an extra tiny printed product, like a pen, it of course gets extra tricky to find room for a credit line. If the pen includes the URL of your client's website, and that website uses the same logo with clear and complete attribution and copyright information, I would probably consider that acceptable.
That said, it is a waffle zone. The example above on its own certainly doesn't meet the full requirements of "attribution" spelled out by the CC-BY licence. However, the CC licences specify that attribution should be "reasonable to the means, medium, and context of use", and so when space is at a premium a link to a page with the full copyright information would probably be considered reasonable. (But I'm not a copyright lawyer!)
In that way, CC is a more flexible than other licences which were drafted specifically for software and which therefore make assumptions about the medium by which something will be copied. For example, the icon above* is available as part of a public CodePen "pen", and is therefore released under the MIT software license. The MIT licence requires all "copies" to include the copyright and licensing information, with no stipulations about reasonableness to the medium.
*(which I created and therefore am free to use however I see fit, including using it here!)
I would always search the site for any attribution requirements or guidelines. In the absence of that, the The Noun Project has some clear and concise instructions for different forms of media that can be reliably used as a guideline:
- Websites - Include the attribution either on the page where the symbol is displayed, or in About or Credits pages.
- Video - Include the attribution either on the page where the symbol is displayed, or in About or Credits pages.
- Apps - Include the attribution either on the page where the symbol is displayed, or in About or Credits pages.
- Magazines - The attribution should be displayed either in the same article as the symbol, with the colophon, or at the back of the magazine.
- Books - The attribution should be displayed either on the same page as the symbol, with the colophon, in the bibliography or Credits section.
- Posters - The attribution should be displayed either on the same page as the symbol, with the colophon, in the bibliography or Credits section.
They also have a more general blurb in their FAQ about attribution:
Please list the attribution as specified by the designer in license.txt file included in the icon's file folder (this is the same file that holds the .svg and .png files for the icon). The designerâ€™s attribution must be followed by â€œfrom The Noun Project collectionâ€ (either hyperlinked to thenounproject.com or with thenounproject.com written out) and should be listed next to or around the symbol in reference. See medium-specific attribution requirements for more information.
- Example 1: â€œTreeâ€ symbol by Joe Smith, from The Noun Project collection.
- Example 2: â€œTreeâ€ symbol by Joe Smith, from thenounproject.com collection.