Sgt_Kickaxe - 2:53 am on Sep 12, 2012 (gmt 0)
Some companies, especially on Youtube, are using automated bots to crawl sites/videos and find duplicate content which then cause the bot to report the url to Google.
You can catch a bunch of them by downloading a wikimedia file of a nasa rocket launch for example and load it to your youtube account. The wikimedia/nasa video is not copyrightable on several levels. The bots from news agencies will then trip all over the footage wrongfully thinking they are the copyright owners because they published parts of the videos earlier in their news reports.
Unfortunately that means using any part of even allowed public content may yield DMCA complaints against you, and that's not a good thing.
I'd recommend doing it manually and target repeat offenders and the most blatant companies(yes, companies will scrape more than individuals nowadays). Slap your site logo on any image/video/flash files.