Is it enough to attribute CC licensed media through a URL only?
<p>I have made some videos for computer education. </p>

<p>I might be sale it in future...</p>

<p>I have used images which comes under
<a href="https://creativecommons.org/" rel="nofollow">creative commons</a> and from <a href="https://pixabay.com/" rel="nofollow">pixbay</a> license.</p>

<p>I want to know is that compulsory to give credits for that images in my video.</p>

<p>Right now I  have shown the URL's at the end of video, from where I have downloaded these images. </p>

<p>Is that ok to put the URLS ? </p>

<p>From pixbay:</p>

<blockquote>
  <p>All images and videos on Pixabay are released free of copyrights under
  <strong>Creative Commons CC0</strong>. You may download, modify, distribute, and use
  them royalty-free for anything you like, even in commercial
  applications. <strong>Attribution is not required</strong>.</p>
</blockquote>

<p>So you need to figure out which CC license your other photos carry and comply. </p>

licensing creative-commons