On the internet I found three worth mentioning tools that can really help you find sites which have illegally copied your content.
1. Copyscape
It is most common and popular plagiarism detection tools that helps identify web sites that have copied your text. To use this tool just paste your website address and Copyscape will search whole internet and show you the list of urls containing your content.
But the only problem with this tool is that free version of Copyscape offers limited set of features and number of scans is also limited per month.
2. blekko
This is a search engine but it can be used to check copied content. Plus point of this tool is that it doesn't limit the number of queries. To use this tool open blekko and enter your site's address with suffix "/domainduptext". For example for www.google.com command will be:
You can take help from Digital Millennium Copyright Act for protection of your content. And if your content is copied at some Google subsidiary you can use Google Support to get it removed easily.

It is most common and popular plagiarism detection tools that helps identify web sites that have copied your text. To use this tool just paste your website address and Copyscape will search whole internet and show you the list of urls containing your content.
But the only problem with this tool is that free version of Copyscape offers limited set of features and number of scans is also limited per month.
2. blekko
This is a search engine but it can be used to check copied content. Plus point of this tool is that it doesn't limit the number of queries. To use this tool open blekko and enter your site's address with suffix "/domainduptext". For example for www.google.com command will be:
www.google.com/domainduptext
3. DMCAAnother great tool for removing illegal content from internet. This site provides professional assistance to help you maintain your copyright.You can take help from Digital Millennium Copyright Act for protection of your content. And if your content is copied at some Google subsidiary you can use Google Support to get it removed easily.

