Copyright infringement is taken very seriously and it is a subject we encourage our group members to understand and discuss openly.
If you find someone has violated your copyright you should report it to DA. They have the resources to conduct a full investigation.
To report a copyright violation of your work simply open the image or images in question. Once open scroll down to the bottom of the page and look for the "Report Deviation" icon on the bottom right. Click on it and follow the prompts. If Da confirms a violation they will exercise the appropriate action.
DA has created a series of Journals addressing this subject. Click on The Art Theft Discussion. for answers to any questions you may have.