Here are links to some of the resources:
Creative Commons Licenses:
https://creativecommons.org/licenses/
Free Stock Photos:
http://thestocks.im/
http://www.pixabay.com
https://www.pexels.com/
http://nos.twnsnd.co/
http://publicdomainarchive.com/free-stock-photos/
https://search.creativecommons.org/
Paid Stock Photos:
http://www.depositphotos.com
http://www.shutterstock.com
http://stock.adobe.com
http://www.dreamstime.com
http://www.bigstockphoto.com
http://www.123rf.com
Copyright Infringement Cases:
http://www.contentfac.com/copyright-infringement-penalties-are-scary/
Deal Newsletters:
http://www.appsumo.com
http://www.mightydeals.com