If the website owner fails to respond to your email requesting removal of plagiarized content, it may be time for you to send a formal DMCA letter to his web hosting company and also to his advertising partner(s) (like Google Adsense) that are helping him monetize content which is actually owned by you.
While web hosting firms and online advertising companies will immediately comply to your requests, they will also ask you to send them DMCA notices in a proper format with all the necessary details and proof.
Let's take a fictional case - Mr John Q. Public of www.mycontent.com finds his content on another website called www.copypaste.com.
Following is a Sample DMCA Notice that John can submit to the web host of copypaste.com and also to Google.
Subject: Notice of Copyright Infringement
The copyrighted work at issue is the text that appears on www.mycontent.com/page1.html and www.mycontent.com/page2.html
The URLs where our copyrighted material is located include www.copypaste.com/abc.html and www.copypaste.com/xyz.com
You can reach me at firstname.lastname@example.org for further information or clarification. My phone number is +1-202-393-3984 and my mailing address is John Q Public, 323, Park Avenue, Willcity 39232 CA.
The email address of the website owner, who has reprinted our content illegally, is email@example.com.
I have a good faith belief that use of the copyrighted materials described above as allegedly infringing is not authorized by the copyright owner, its agent, or the law.
I swear, under penalty of perjury, that the information in the notification is accurate and that I am the copyright owner or am authorized to act on behalf of the owner of an exclusive right that is allegedly infringed.
John Q Public
February 11, 2010 [14:50]
If your DMCA Notification letter meets all the requirements, the web host will expeditiously delete (or ask the customer to remove) that material.
While most web hosting companies will accept your DMCA notices via email, Google (for Blogger and Adsense) requires you to snail mail or fax the DMCA document with your signatures.
As a workaround, you can take a picture of your signature and paste that as in image in the Word Processor. Then you fax the document to Google DMCA department via Skype, Email or online.
More on Online Content Plagiarism.