Finding high quality copyright free icons for computer diagrams in IEEE or ACM submission I am a new graduate student in computer science and starting to submit papers to IEEE and ACM. I would like the diagrams to look as professional as possible. For example, if I am showing a digital attack on a computer network, I would  like computer and server node icons etc. I was able to find these common ones easily in many WYSIWYG graphics editors. 

However, an icon of a "hacker" or "attacker" is harder to find by default since these are more 'niche' if you will. For these I notice that I can use IconFinder, however many icons have a Creative Commons license -- which generally means that I should attribute the original creator. Since I use many icons in my diagrams, it would be easier if I can find some that do not require attribution.

I noticed that the Creative Commons BY 3.0 license has a clause that says: 


  You do not have to comply with the license for elements of the
  material in the public domain or where your use is permitted by an
  applicable exception or limitation


Now I have two main questions:


Does that clause I quoted mean that I can use it in a paper going to
IEEE or ACM or such publications? Is that considered public domain?¹
How do you find icons that you can use freely in your paper without
the need for attribution?




¹ I realize this borders on "legal question" and someone might be reluctant in answering it. Just making it clear that I would not hold anyone or Stack Exchange liable for any advice given.
The quoted part means that you don’t have to follow the license if you are allowed to use the icon anyway (without the license).

This could be the case if the icon is in the public domain, if its use would be allowed by something like fair use, the right to quote, or similar.

In other words: the license can’t restrict you from doing something which you are allowed to do according to copyright (and other relevant) laws. Copyright licenses (like CC BY) give additional permissions (under certain conditions), not additional restrictions.

If you don’t know for sure that the icon is in the public domain, or that your use would be legally allowed, better assume that you have to follow the license.



Most licenses require attribution. All of Creative Commons’s licenses do (as they all have the "BY" component).

If you really don’t want to attribute your icons (the attribution doesn’t have to appear next to the diagram, if that’s what you are concerned about), you have three options:


Use icons that are published under a license that doesn’t require attribution. It doesn’t have to be a known copyright license, it could also be stated in the terms of a service of the icon site.
Use icons that are in the public domain. The author would have to state this somehow (e.g., by saying "public domain", or by using the public domain dedication CC0 1.0, or one of the other public domain equivalent licenses), or you would have to know that the intellectual property rights have expired.
Use icons that don’t meet the threshold of originality. Of course it’s not easily possible to know if that’s the case. Better be safe than sorry and assume that all except the most simple icons are eligible for copyright protection.