There have been some dust storms lately about a splog (nixforce.com) reproducing Planet Debian and Planet Ubuntu content, and probably others, without obeying the author licenses that the content is being written under. DMCA notices have been issued, and Google notified for improper use of ads on their site. I personally have emailed the webmaster, requesting to take me off of his site, as he is violating the license my blog content falls under.
To those bloggers that have been offended, or others that may be in the future, you should probably make it painfully clear what license you are willing to publish your content under, then make that license highly visible on your site. My content is published under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States license. I have spelled out the terms of the license under a separate page, with a link to the page found under the header section of the site. I would recommend that others do the same.
To those who are mirroring such content. I would highly suggest that you check to make sure you aren't violating any licenses. There is legal recourse that can be taken. Hopefully, however, we never need to resort to those measures. If DMCA notices are issued, please comply. If emails are mailed, please comply. I am of the nature where I will first try to contact you via conventional means. I just don't like to make a fuss. But, I have the DMCA take down notice at my disposal. I just hope I don't have to use it.