I find it interesting that MPV took so long to file. I think there's more to this story than meets the eye.
Also, note the mention of a mis-file of the patent using a patent name owned by Warner above. I wouldn't be surprised if WB submitted their own patent for the tech after the confidential disclosure from MPV in order to secure patent rights. This assumes MPV isn't the one pulling something here.
An example: Perhaps MPV didn't get the patent fully registered before disclosing to WB. Now WB goes and patents the same thing, using their bottomless pockets to expedite the process, (or something along those lines.) Whether through this or other means, WB may have succeeded in giving themselves the legal foothold they need to claim legitimacy.
Now, I hate WB (and many similar criminal-corporations) so much that I typically avoid their media, even when it's 'free'. Nonetheless, I expect WB will win this, even if they deserve to lose it.
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Also, in response to Blue-State's post above, many of the anti-piracy technologies may be a fumble-fingered and frustrating for legit users in their designs, but the technology incorporated is at the request of media-controlling corporations. It's Warner's fault (and that of similar corporations) that they use the technology, not MPV's. It's Warner's fault that they criminalize such a wide variety of uses as piracy, not MPV's. And it's Warner who is apparently going and practicing hypocrisy in regards to their anti-piracy values.
MPV may build the weapons, but Warner is the one who decides where and when to point and shoot.