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Stanford Researchers Trying to Protect P2P Networks

dirvish writes "New Scientist has a story about efforts from researchers at Stanford to protect peer to peer networks from attacks that could be permitted by the proposed Berman Bill. Neil Daswani and Hector Garcia-Molina of the Database Research Department at Stanford University have mathematically modeled the Gnutella network to discriminate between nodes and supernodes. They then tested the nodes to find which rules could be applied to best avoid a malicious node on the network thus conserving bandwidth."

43 of 143 comments (clear)

  1. Is all this work really worth it?? by TooCynical · · Score: 5, Interesting

    Maybe the goal of all of these legal machinations is to make it all so much work that it is no longer worth the effort to take the short cut.

    --
    Homer: Facts are meaningless, you can use facts to prove anything that's remotely true!
    1. Re:Is all this work really worth it?? by Paradox+!-) · · Score: 5, Insightful

      Well, I think userfriendly put it best, in that case.

      There's a trade-off the RIAA and others like it (MPAA) don't realize. The kind of tactics they're using are not just driving people away from the sanctioned download sites, but they're driving people away from CDs themselves!

      They're hurting their own user base. Right now, it's a very small percentage of that user base, but it's the educated and motivated portion, which is a danger to them in the long-run.

      The Republican takeover of the (U.S.) Senate has at least one positive outcome - the indefinite shelving of the Hollings bill.

    2. Re:Is all this work really worth it?? by icewalker · · Score: 5, Interesting

      If the Berman bill is passed, would not this research be considered a circumvention technology according to the DMCA?

      --
      The truth is usually just an excuse for lack of imagination.
  2. JOIN the EFF. It helps. by laetus · · Score: 5, Insightful


    Circumventing attacks technologically is a good thing.

    But stopping Congress from passing bad laws is equally as important. Join the Electronic Frontier Foundation and help build a lobbying group that can defend our rights. Her's more info about what your money can do for all of us.

    --

    "We're sorry, but the website you're trying to reach has been disconnected."
  3. Honestly... by acehole · · Score: 5, Interesting

    The riaa/mpaa are going about the whole P2P debacle the wrong way. Havent they learnt the lesson from what happened when they shut down napster? How many P2P services popped up in it's place? and they were even more sophisticated.

    You can't cut the head off the p2p snake, you try and at least two or three take it's place.

    RIAA/MPAA should be looking at other alternatives rather than going in guns'a blazin'

    --
    Be you Admins? nay, we are but lusers!
    1. Re:Honestly... by Anonymous Coward · · Score: 5, Interesting

      Thing is, there is no particular alternative for them. They're "scribes in the age of the printing press". Their best hope, which will only slow their demise, is to do as the scribes did in england, and get the king to forbid printing except by royally approved people. That is to say - what they're doing right now, getting the government to pass laws outlawing progress.

      They're also trying a tactic not very available to the scribes at the time of the printing press - the production of crippled printing presses that couldn't easily copy some documents. But that's like trying to legislate fixed-type printing presses when the movable-type printing press already exists. Again, won't work in the long run.

      In the long run, the internet means that there IS NO "Information Economy". Economy as humanity knows it is effectively the redistribution of scarce resources, and the internet makes information non-scarce. Imagine your neighbour had a magic-car-cloning-ray. Would you begrudge him a clone of your car? You'd still have a car, he'd still have a car, everyone's better off.

      It's not like he'd be stealing your car. Well, the internet is a magic-information-cloning-ray.

    2. Re:Honestly... by dirk · · Score: 4, Insightful

      The problem is that people aren't "printing" their own material, they are using what the RIAA puts out. If the RIAA closed shop tomorrow, the face of P2P wouldn't change at all. It would still be used to trade songs that were put out by the RIAA. I have no problem with people using P2P to put out music they own the copyright on, but this is about .001% of the traffic on P2P networks. The RIAA isn't upset because the P2P networks are being used by people to put out music not on the RIAA labels (because that is not what is happening). They are angry because P2P networks are being used to trade music that the copyright owners don't want traded.

      I'm sure the RIAA would like to control all distribution, but that is not what this argument is about. They didn't want Napster to stop trading all music, they wanted them to stop trading the music the RIAA controls (which, whether you like it or not is their right). Napster could still be around trading music from indie bands that want their stuff traded on it, but no one is interested in that, they are interested in downloading the newest Britney or Backstreet Boys song. If there was P2P that only traded in non-RIAA songs, the RIAA couldn't touch it, but anyone who makes P2P knows that people won't use it if they can't get what they want, and what they want is what the RIAA owns.

      --

      "Information wants to be expensive" - Stewart Brand, the same guy who said "Information wants to be free"
    3. Re:Honestly... by ReelOddeeo · · Score: 5, Interesting

      They didn't want Napster to stop trading all music

      Ah, but they did want Napster to stop trading all music. I remember on CNet when I saw a major setback in their case when the Judge said that they needed to provide a list of all copyrighted materials that Napster should be blocking. (I'm not discussing here the merits of trying to block selected content.) They weren't able to just close Napster down, because it did have non-infringing uses. If their copyrights were being violated, then they needed to produce a list of the infringed upon works. This was a major setback, and not what they were asking for.

      A few years earlier, they sued Dimond for the Rio mp3 player. Stop all playing of sounds on a new type of device, just because it could be used to infringe copyrights. For the same reason this failed.

      They also tried to get rid of audio home recording. Remember even back in the 1970's when they started putting these scary sounding copyright warnings on record albums? They didn't want you even copying to a cassette tape.

      They want Napster to stop trading all music, because then you would have a way to listen to music that they don't approve of. (This may sound insane, but it is a plausible conclusion from the facts.)

      --

      Those who would give up liberty in exchange for security and DRM should switch to Microsoft Palladium!
  4. Re:JOIN the EFF. It helps. by SpikeSpegiel · · Score: 5, Insightful

    More importantly, Join the ACLU. The EFF has practices that unfortunetly go against practicality. The ACLU is an old and established group that fights for our rights. They do fight for our first amendment rights anywhere, including on the web. Lobbying againt the right wing republicans and ashcroft is a good thing

  5. Super-Node and Regular Nodes? by Zech+Harvey · · Score: 5, Insightful


    This technology seems to be a bit limiting from the story, would someone be able to provide more detail? I'm a bit concerned that it would significantly reduce the ability of a normal node to request files indenpendently of everyone else. It seems right now alot of P2P services suffer from "Me too" style networks, where if it is new and popular, everyone has it. But if it is even remotely indie, it seems you're the only one looking.

    (as a slightly off-topic aside) Maybe that's just my bad luck, but I've been noticing that trend for awhile now. I wonder if that was the work of the *AAs...plague diverse and robust information exchange systems with a monomeme. Hmmmm....

    --
    Zech Harvey, MCSE, MCDBA, CCNA
    1. Re:Super-Node and Regular Nodes? by asavage · · Score: 3, Informative
      This technology seems to be a bit limiting from the story, would someone be able to provide more detail?

      If you remember Gutella at first, every node was equal, so every search had to go to the 3 or 4 you where connected to and then the 3 of 4 they where connected to, and people with old computers and slow connections really slowed searching down. Now they (and KaZaA) use super nodes or super peers that have fast computers with lots of ram and a fat pipe. If (say) 20 people connected to a supernode, and the supernode was connected so several other supernodes, search speeds are improved dramatically.

  6. Don't you mean by Rogerborg · · Score: 5, Funny

    GNU/EFF?

    --
    If you were blocking sigs, you wouldn't have to read this.
  7. this is just another example... by Diver777 · · Score: 5, Insightful
    of people being able get around anything the RIAA wants! Do they not realize that no matter what copy protection they decide to force on me that somebody will crack it.

    If you can see it, and you can hear it, somebody will figure out a way to copy it

    Any fighting back is simply bad business for the RIAA. They need to embrace the Internet, and include it in their business model in a much larger way. Gone are the days where people spend $20 on a cd, at least most people.

    --
    The reason Santa is so jolly is that he knows where all the bad girls live.
  8. What about Freenet? by Nicolai+Haehnle · · Score: 5, Interesting

    I thought Freenet - http://www.freenetproject.org/ - is supposedly designed with DOS attacks etc... in mind.

    Yes, it apparently suffered from /. effect after the 0.5 announce, but things are improving.

    1. Re:What about Freenet? by cwhicks · · Score: 4, Interesting

      Go give Freenet a try and you'll see why this other project is neccessary.

      --
      - I like pudding.
    2. Re:What about Freenet? by Loki_1929 · · Score: 4, Insightful

      "supposedly designed with DOS attacks etc... in mind"
      "it apparently suffered from /. effect"

      So it handles DoS's, just not very well? :)

      I hopped in with the rest of the /. crowd after 0.5, and even now it's not the least bit of a practical solution. Look at the usability for the non-technical community. Do you really think your average Kazaa user can just hop on over to Freenet and have the slightest clue what to do? From all I've seen so far, Freenet is much like how the early WWW was (in late 80's early 90's); hard to navigate, tough to find something unless you know what you're looking for. When there's a fast, reliable search engine that's easy to use, then Freenet will be close to ready. When there's no more data lose on the network, then it will be just about complete. When it's much, much faster (takes upwards of 3 or 4 minutes for a freesite sometimes), then and only then will it be a replacement. Until then, we best hope the research yields usable results for the kazaa/gnutella developers.

      --
      -- "Government is the great fiction through which everybody endeavors to live at the expense of everybody else."
  9. But are their motives good? by SexyKellyOsbourne · · Score: 3, Interesting

    Though they are researching ways to prevent attacks on the network, who says they're going to use it to actually protect them?

    The chances are good that the researchers are going to want to keep their funding to their college from their corporate masters, and the knowledge is going to be given to the record companies to be used AGAINST the p2p networks.

    1. Re:But are their motives good? by smd4985 · · Score: 5, Informative

      well, since i know neil (he is my brother) i can vouch that his motives are good. he is very opposed to the berman anti-p2p hacking bill and he feels that any attempt to hack p2p networks will just be foiled by better p2p infrastructure.
      also, i'm not positive who is funding his research (that info is all public, if you look you can find out for sure), but i think it isn't corporate in nature - i think it is the defense dept. the US defense element has a high interest in securing p2p networks from attack since future military operations might be based on p2p technologies.

      --
      smd4985
  10. Payback by Pointy_Hair · · Score: 4, Interesting

    It's one thing for the Industry to have legal sway to launch attacks... but I wonder if they realize the potential for retaliation that awaits them?

  11. Knowledge is power by nuggz · · Score: 5, Insightful

    If the RIAA or another group knows more about how p2p works then everyone else they will have an advantage.

    If other groups do research at least it will be a fair fight.

    Maybe if looking at different types of attacks methods to protect against them will be found. If effective means can be found to validate requests this could go a long way to reducing all types of DOS attacks.

    Attacking defending p2p networks is just a special case. This sort of research may be widely applicable.

  12. Re:JOIN the EFF. It helps. by Anonymous Coward · · Score: 4, Insightful

    Naah, tech defences are better. Who gives a shit about US laws? I mean, apart from Americans, and they've hardly been very successful in stopping legal attacks on free speech.
    "Land of the free" indeed. You guys need a new slogan.

  13. LAW and P2P by locarecords.com · · Score: 4, Funny
    Thats not the point. The danger is they'll resort to LAWS that hand out outrageous sentences to stop you even thinking about it.

    How about five years in prison for propsing/implementing a copying/p2p technology? Or the threat of a huge $100000 fine?

    Strangely mostly people will be put right off. And peer-to-peer requires a peer to peer to...

    The man with the lone telephone has no-one to call...

    --
    ---- The Open Source Record Label : : LOCARECORDS.COM
  14. What about legal attacks? by SystematicPsycho · · Score: 5, Interesting

    It seems the most vicious and lawful attacks are the ones that go _noticed. They also come along with large costs and could shut the whole network down. These attacks are from music industry and hollywoood based corporations. Not only that but they probably pay malicious hackers to carry out real attacks.

    How to respond: find those loopholes and exploits in the legal system. Patch and re-open with a new and improved legal proof network. Continue the work at Stanford.

    --
    Analytic & algebraic topology of locally Euclidean meterization of infinitely differentiable Riemmanian manifold
  15. and once again... by RebelTycoon · · Score: 5, Funny

    Nothing will stand inbetween a geek and his porn.

    Nothing like earning a Masters/Ph.D that has practical business application.

  16. The answer is rather simple. by asdfasdfasdfasdf · · Score: 5, Insightful

    Someone needs to come up with a network that has file-rights management that lets you literally *share* your music. Once every device is wireless, even with DRM, you can just own say 25 CDs, and you can allow them to be shared into the network, so long as you lose the right to listen to them as they're being played on someone else's device. Because you (currently) legally own the right to share it (ie, give it away temporarily, as you would a pressed CD), once you've listened to a song, it's released back into the system for someone else to borrow.

    Basically, the system will allow you to legally borrow on a song by song basis. This should meet all current legal issues, because you will not be able to listen to a song while someone else is. But, because everyone doesn't listen to the same song at the same time, not everyone has to own every CD.

    Even if DRM is implemented, there must be a way to transfer a file from device to device (assumably removing it from one device) This "system" will just facilitate that transfer on a temporary, song-by-song basis, and keep track of who permenently owns an individual song.

    Think of it as a "universal library."

    I would love to see the record companies try to find some problems with this. I think the supreme court would smack em on their collective asses.

    Wireless+"True Sharing"+Lending Distributer = Totally legal way to screw the record companies.

    1. Re:The answer is rather simple. by aussersterne · · Score: 4, Insightful

      Except this is another artifical limit where there need not be one. It is Steinbeck's Grapes of Wrath all over again -- artifically limiting access to important resources in the interest of maintaining profits.

      The cost to copy information in this age is *zero*. The worst thing we can do is use governments as a way to enforce artifical limits on such a valuable commodity which has been so difficult to come by for so long across most of the human race.

      Instead of trying to reinvent newer technologies to remove their benefits and make them as useless as older technologies, we should be rethinking the paradigms which say that only some people should have access to information, as well as the paradigms which say that people have some inherent right to profit for coming up with it.

      The age of the Internet may well be the beginning of an age of 'new communism' -- people contribue what they can, with the expectation that in return they will receive other peoples contributions as well; it is in in this way tjat they are fairly compensated. Rather like the way the free software movement works now.

      I think the age of the "information economy" should be brought to an end entirely. It would be a shame to take the Internet, which is like an infinite hyper-library, and modify it so that it once again behaves like an old-fashioned book-based library, simply to ensure the maintenance of some kind of "information drought" status quo in the interest of profits.

      More than a shame, I think it borders on evil to deprive others of knowledge that there is no *real* barrier to their having.

      --
      STOP . AMERICA . NOW
    2. Re:The answer is rather simple. by brassman · · Score: 5, Insightful

      Unfortunately this common-sense approach has already been shot down in flames. Remember the site where you had to prove that you owned the physical CD before you could access an online copy of it? That should have withstood legal challenge -- but it didn't. The recording industry somehow found the best judge money can buy....

      --
      "Ain't no right way to do a wrong thing."
  17. Re:JOIN the EFF. It helps. by Erasei · · Score: 5, Insightful

    Lobbying againt the right wing republicans and ashcroft is a good thing

    That is your opinion, and you have every right to it. It just really bothers me when people say their opinions as facts that everyone else should acknowledge. Personally, I signed a petition showing my support for Ashcroft, which I would sign it again today if it was needed. He agrees with a lot of the things that I agree with. And, Yes, that is my opinion. The ACLU fights for the rights they believe in. Granted, not ever group can defend all of our rights. That is why you should support the group that most aligns with your own ideals. In my case, it would be the EFF, and Ashcroft. The two are made up of- and are people just like you and I. Just as we don't agree, in some cases, they don't either. Such is life.

    --
    visit my free wallpaper collection, wp.erasei.com
  18. Long Term by AntipodesTroll · · Score: 5, Insightful

    In the long term, the most that you can say about the proposed bill, and research into protecting p2p, is that it will simply turn into a technological arms-race.

    That will continue indefinetly, the real answer is not to allow such a blatantly stupid and damaging bill to be passed, and if it is passed, to get it struck down as soon as possible. Passing the technological edge back and forward in a war between the media monopolies and their p2p opponents, might sound fun to some, but its not the real answer.

    --
    Anyone who considers arithmetical methods of producing random numbers is, of course, in a state of sin.-John von Neumann
  19. Re:JOIN the EFF. It helps. by Steve+Franklin · · Score: 5, Insightful

    "which I would sign it again today if it was needed"

    No comment required on the above. These are indeed Asscraft's constituents.

    The above story describes a classic example of a technical fix for what is essentially a political problem. That congress would even consider a bill legalizing such nefarious activity on the part of a corporate elite speaks volumes about who these people in Washington really are. Though I do believe that the difference between Republicans and Democrats is only a matter of degree, I must say that Asscraft has taken political demagoguery to a level heretofore unknown since the invention of writing.

    "Lobbying against the rightwing Republicans and Ashcroft is a good thing."

    I would only amend this to say that "lobbying against the rightwing" politicians of whatever party "is a good thing." I would also dare to suggest that lobbying against leftwing politicians who have fallen under the charm of massive corporate campaign contributions to the extent that they support bozo legislation that can only lead to a technological spy-vs-spy series of escalating dirty tricks is a good thing.

    --
    Hic iacet Arthurus, rex quondam rexque futurus.
  20. Will the riaa ever figure out... by rynthetyn · · Score: 5, Interesting
    ...that they can use piracy to their advantage? In the weeks before Eminem's latest album The Eminem Show was released, people got a hold of bootleg copies of the album, and it became fashionable to be seen driving around with The Eminem Show blaring from your car radio. The presence of pirated cds didn't hurt the sales once the album was released, instead, it just increased interest in the album, and it would be interesting to see how many people went out and bought that album in the first week just because of the publicity from the pirated copies that were floating around.


    The RIAA needs to figure out that they can capitalize on the piracy, because whether pirating music is ethical or not, it's going to happen. I wouldn't be surprised to find out that the pre-release bootleg copies of The Eminem Show were really part of a stealth marketing campaign or something.

    --
    Eagles may soar, but weasles don't get sucked into jet engines...
  21. From the article... by Tha_Big_Guy23 · · Score: 4, Interesting

    "The P2P Piracy Prevention Act, proposed by Senator Howard Berman, is currently being redrafted following severe criticism and is not likely to be introduced in any form until January 2003 at the earliest."

    So this basically means that it's being rewritten and filled with all sorts of terms that most of the people in the senate aren't familiar with, and that most of them could care less about. It's all about misdirection. People went up in arms about the original bill, because they understood what it was talking about. The redraft, will more than likely be the same identical document. The only difference between the two, is that the second will have 40 pages of filler information that is there to confuse and misdirect those reading it, so that it becomes more of a hassle to read and comprehend it, than to just pass it along. That's just my opinion anyway.

    --
    If you're looking here for something insightful or thought provoking, you're probably looking in the wrong place.
  22. Re:Bad analogy by aussersterne · · Score: 5, Insightful

    I do believe the auto companies would be quite upset if people stopped buying cars

    But you are missing the point. If we can now clone cars, there is no need for automobile assembly lines, since we can *all* have a car. What the IP proponents are proposing is that the cloning machine be outlawed in order to keep the auto manufacturers in business because they have some inherent right to exist, even at the expense of the populace at large. NOT COOL.

    "But who will design the new cars?" some will ask.

    Listen, if we have cloning machines and everyone can clone what they need, there will be a great deal more time for hobbyists who like to design new cars to come up with really fun new designs on their own. And as new designs come out, *everyone* can have one. No artificial limits, and everyone benefits, you see?

    This is exactly what happens now in the free software community, so often maligned as idealists and communists and whatever else... but nobody can deny that the software is excellent... and that the programmers who work on it are happy, because they can work on what they like to work on, contribute it to the world, and expect other peoples' excellent contributions in return... it's a wonderful new age. Why kill it to save some company?

    --
    STOP . AMERICA . NOW
  23. Re:JOIN the EFF. It helps. by mumblestheclown · · Score: 3, Interesting
    Legislators make laws. Engineers build missiles.

    If the government makes a law that says you can't use missiles to blow up other cars in traffic, then the engineers have to abide by that law, even if they have access to plenty of knowhow and missiles. If the engineers want to blow up traffic with their missiles, they have to lobby legislators.

    Explain to me again why similar logic should not apply to these stanford computer scientists?

    If they are indeed working on systems to which the law does not apply, then that's one thing. That's scientific progress and appropriate technology policy needs to be formulated. But trying to tell legislators "we know better than you" is immoral.

  24. Missouri told me what Ashcroft was by paiute · · Score: 5, Funny

    I had no opinion of Ashcroft until the good people of Missouri, who presumable know him best, voted for a dead man instead of him.

    --
    If Slashdot were chemistry it would look like this:Cadaverine
  25. Except--- by asdfasdfasdfasdf · · Score: 3, Insightful

    That your arguments make the (false) assumption that IP is valueless in all instances. Sure, the cost to copy digital information is (virtually) nothing, but that information itself has an inherent cost.

    My brother is an independent recording artist. He's not signed to a label, but has a decent following. When he wants to produce a CD, the manufacture of tracks, mixing, engineering those tracks cost money. Hiring and paying engineers and additional musicians is not free. Even if you remove all barriers in distribution (ie distribute digitally; no record company) The actual recorded material has an inherent cost-- and therefore an inherent value.

    While you're saying buzzwords like "rethinking the paradigms" perhaps you should be considering more than the distribution method.

    While the most extreme of cyber-communists point to the open-source and free-software movements as an example of how "information should be free" They neglect to realize that the media created is a drop in the bucket compared to commercial software-- especially entertainment. Name one open source or free software game that can come close to competing with Grand Theft Auto or Age of Empires or Black and White or Resident Evil. They can't.

    So, until the entire world becomes a communist state, where there is no money, and no motivation to work other than the betterment of mankind, (and this includes cleaning the toilets and laying the asphalt) people will be motivated by money, will need to be paid for their work, which will give an inherent value to IP.

  26. The oldest trick in the book... by Windcatcher · · Score: 3

    Attach it to something that the administration really wants, like the bill that would make the tax cut permanent. Expect Berman to try this; it would be really hard for the Republicans to fail to pass a bill that made the tax cut permanent, and harder for Bush to veto it.

  27. Re:JOIN the EFF. It helps. by palme999 · · Score: 4, Informative

    Lobbying againt the right wing republicans and ashcroft is a good thing

    I don't think it's the republicans you have to worry about. The democrats have been the ones pushing this legislation. A couple recent examples including the p2p bill in question:

    CBDTPA (Consumer Broadband and Digital Television Promotion Act) - Sponsored by Sen. Hollings (D-SC), co-sponsored by 4 other dems and one republican.

    P2P Bill - Sponsered by Rep. Howard Berman (D-Cal)

    Also take a look at how the Music/Movie industry spends their money. 17 of the top 20 recipients are Democrat.

    TV/Movies/Music: Top 20 Recipients

    Now who would you say is in the back pocket of the Movie/Music business?

  28. Re:JOIN the EFF. It helps. by Glytch · · Score: 5, Insightful

    Or maybe the engineers will just kill the legislators with their missiles and avoid the problem entirely. It's hard to pass laws when you're dead.

    But trying to tell legislators "we know better than you" is immoral.

    Yes, god forbid we should tell our elected representatives what we want them to do. Who the hell do we think we are? Citizens?

  29. Re:JOIN the EFF. It helps. by pmineiro · · Score: 3, Interesting

    More importantly, Join the ACLU. The EFF has practices that unfortunetly go against practicality. The ACLU is an old and established group that fights for our rights. They do fight for our first amendment rights anywhere, including on the web. Lobbying againt the right wing republicans and ashcroft is a good thing

    I belong to both. I first joined the ACLU, but then I noticed that while they do alot of excellent work, they get alot of their money and support from wealthy people in the media industries. It therefore seemed there were certain issues, relating to copyrights and intellectual property, for which the EFF seemed more aligned with my interests.

    I think both are excellent organizations.

    -- p

  30. Sad state of affairs by Anonymous Coward · · Score: 3, Insightful

    It is rather a sad state of affairs when university researchers are actively working to circumvent a (potential) new law. The government should really be wondering if this new law is a good thing, when a major, well-respected university is already fighting it!

  31. Re:JOIN the EFF. It helps. by Beliskner · · Score: 3, Funny
    "Land of the free" indeed. You guys need a new slogan.

    Comrad, you need to report to a re-education camp.
    Try this:
    Al-Akhwan Jihad Academy,
    South Kandahar,
    Afghanistan

    Salary:
    free religious training & Stock Options in Heavenly pleasures (cashable upon death - shaheed)
    Special perk: **FREE AK-47**

    --
    A caveman dreams of being us, the incalculable power and riches. We dream of being Q, then what?
  32. Is this a "circumvention of copyright protection?" by Tsar · · Score: 4, Insightful

    If RIAA attacks P2P networks with the stated intention of protecting their copyright, wouldn't systems for countering that specific threat be in violation of the DMCA?

    It would seem defensible if it were framed as an effort to make P2P more robust in general, but to describe it as a hedge against actions of the copyright holders, IMHO, opens them up for some serious deep-pocket litigation.