How to use CC0 license?
<p>I am a software developer and i am working on a mobile app, in which i am using images.
I took all these images from a website, and according to this website, they all have a Creative Commons Zero (CCO) license, so i am sure i can use them.</p>

<p>I ended up downloading them and using them in my mobile app.
However i have a feeling that it's not enough.</p>

<p>Let's imagine someone wants to sue me saying the images i use don't have license, how can i proove him i am right ?
Just sayin "i read the website and drag and dropped" seems a bit messy to me.</p>

<p>Is there any legal document i should do or any best practices, so i will be sure i won't get sued ?</p>

<p>I want to be sure i can proove i am in my right</p>

<p>Only the copyright owner can grant an original licence (CC0 or otherwise). Some licences (like CC0) allow legitimate licence holders to grant licences also.</p>

<p>To be <em>certain</em> that you have a legitimate licence <strong>you</strong> must trace the work to the original copyright holder. For a photograph, the original copyright owner is the photographer or their employer if they were producing <a href="https://en.m.wikipedia.org/wiki/Work_for_hire" rel="nofollow noreferrer">work for hire</a>. Find them and follow the licence trail from them to you.</p>

<p>This is, of course, problematical. Anyone can <em>say</em> they own the copyright, indeed they may genuinely believe they do, however, they may be wrong. All you can do is make reasonable enquiries.</p>

<p>If you do this or legitimately try and fail to do this, and you’re wrong, then you have committed <a href="https://legalvision.com.au/innocent-copyright-infringement/" rel="nofollow noreferrer">innocent infringement</a>. In Australia this means you are not liable for damages, only an accounting of profits i.e. the copyright owner gets whatever profit you made off their work.</p>

<p>Of course, you can always take photographs yourself - then you know who the copyright holder is. Or buy a licence from a person who runs a legitimate photography business.</p>

licensing