I wanted to share my experience so you know that if you get caught, you will have to face the firing squad and will lose your entire business built around the copyright material.
Here's what happened:
I started a site and business in the Human Resource Management niche some 8 years back. My company basically placed eligible candidates in vacant positions in different companies.
I had a company website that brought me clients regularly. Matter of fact it was contributing to 42% of my turnover. That's big!
Now, I got a logo designed for my company some 6 years back by a freelancer from a top rung freelance site.
What I didn't know was the logo was an exact copy of a financial consulting company based out of the Middle East. The logo colors were different though. So, I basically had a copyright logo (painted in slightly different colors) sitting on my site without me having any clue about the copyright infringement.
4 months back I received a letter from WIPO - World Intellectual Property Organization notifying me about the copyright infringement and that the Financial consulting company (the logo owner) has filed a case against me and also wants a compensation (It was a huge amount).
This was followed by a letter from a "Case Manager" and also a "Trademark Attorney" telling me how to save my back - asking for money is essence.
The same day I received a letter from my domain registrar followed by a letter from the Ministry of Corporate Affairs (this came a few days later) with a notice to shut down my business!
My attorney responded to all letters, but I didn't even get the time or opportunity to explain myself properly.
The clients (advertisers) on my site didn't want to be a part of the problem and pulled off their sponsored ads. In less than a month my business got shut down completely (police raided my office too looking for pirated software and stuff, but they didn't find anything).
I lost a lot of money and my entire business.
I did supply proof to them that the logo was done by a freelancer and I didn't know about the infringement, but it didn't help.
I have other businesses, but this one was big enough for me to let go. I tried everything, but nothing worked.
Never ignore copyright issues. It can cost you dearly, more so once your business grows big and successful. If you are not sure whether or not you are infringing copyrights, better not do it.