So Revision3 seems to be using BitTorrent to distribute legitimate / legal content that they either own or properly license.  They found some folks using their Torrents without permission and blocked them . . . then they came under attack from a fairly large DDoS that took them off the Internet for a few days over Memorial Day.  Here's a blog from Revision3 implicating MediaDefender who actually owned up to it!

http://revision3.com/blog/2008/05/29/inside-the-attack-that-crippled-revision3

Some "juicy" stuff from the blog post . . . I hope they sue the crap out of MediaDefender - DDoS is illegal and since this was one U.S. company attacking another (apparently) it seems they would have a case.

As many of you know, Revision3’s servers were brought down over the Memorial Day weekend by a denial of service attack. It’s an all too common occurrence these days. But this one wasn’t your normal cybercrime – there’s a chilling twist at the end. Here’s what happened, and why we’re even more concerned today, after it’s over, than we were on Saturday when it started.

It all started with just a simple “hi”. Now “hi” can be the sweetest word in the world, breathlessly whispered into your ear by a long-lost lover, or squealed out by your bouncy toddler at the end of the day. But taken to excess – like by a cranky 3-year old–it gets downright annoying. Now imagine a room full of hyperactive toddlers, hot off of a three hour Juicy-Juice bender, incessantly shrieking “hi” over and over again, and you begin to understand what our poor servers went through this past weekend.

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Although I can only guess, here’s what I think really happened. Media Defender was abusing one of Revision3’s servers for their own purposes – quite without our approval. When we closed off their backdoor access, MediaDefender’s servers freaked out, and went into attack mode – much like how a petulant toddler will throw an epic tantrum if you take away an ill-gotten Oreo.