Gydion can start here:
SAMPLE DMCA TAKEDOWN NOTICE TEMPLATE
To Whom It May Concern,
The following information serves to assert my rights and request removal of allegedly infringing web content under the Digital Millennium Copyright Act (DMCA). The following is a report, in good faith, of alleged copyright infringement. I am contacting you as the designated agent for the site upon which the infringing work currently appears. This letter is a Notice of Infringement as authorized in §512(c) of the U.S. Copyright Law.
I am the copyright owner of the works and the following is true and accurate.
1. The original work, for which I claim copyright, appears, with my permission, at the following locations online:
{URLs WHERE YOUR ORIGINAL AUTHORIZED WORK APPEARS}
2. Copies of my original copyrighted work are {attached/included/provided} to assist you in your evaluation and determination.
3. The allegedly infringing {work/text/image} appears at the following location(s) online:
{URLs WHERE INFRINGING WORK IS CURRENTLY LOCATED}
4. My contact information, as copyright holder, is as follows:
{INCLUDE YOUR CONTACT INFORMATION}
5. The information of the alleged copyright infringer is:
{INSERT WHOIS INFORMATION FOR THE SITE YOU ALLEGE IS INFRINGING}
6. I have a good faith belief the use of the above reference copyrighted work(s) that appears on the website for which you are the designated DMCA agent is not authorized by the copyright owner, its agent, or by law.
I declare, under penalty of perjury, this notice is true and correct and that I am the copyright owner entitled to exclusive rights which I allege are being infringed.
Signed this ________ day of ___________, 20_____ in {INSERT CITY, STATE, COUNTY}.
{YOUR SIGNATURE/eSIGNATURE}
The process is explained here:
link