November 29, 2024

PlaysMaybe

Natali Helberger at INDICARE questions Microsoft’s new “playsforsure” campaign. Playsforsure is a logo that will be displayed by digital music and video stores, and media devices. The program has a cute logo:

According to the program’s website,

Look for the PlaysForSure logo if you’re shopping for a portable music or video device and you want to make sure the digital music and video you purchase will play back on it every time. Match the PlaysForSure logo on a large selection of leading devices and online music stores. If you see the logo you’ll know your digital music will play for sure.

So if I buy a product with the playsforsure logo on it, I can play any music I like on it. And if I buy a song from a playsforsure music store, I can play it on any device I like. Right? Maybe not. Elsewhere on the site, we find this:

When your device and music service are compatible with each other, all you have to do is choose the music that’s compatible with you.

Hmm, that doesn’t sound so good. But at least I’ll know that if my device, my music store, and my music all have the playsforsure logo, it’ll work, with no fine-print exceptions. Right? Maybe not.

Look on the back of the device box to see what type of media will play back on the device.

The checkmarks indicate if the device is capable of playing back audio and/or video that’s been downloaded from an online store. Additionally some devices will be able to play back media that has been purchased through an online store that offers subscription or rentals.

Well, at least I know that the engineers are doing everything they can to make their products compatible with each other. Maybe someday they’ll finish that MP3 standard and we’ll be able to play our music on any device we like.


[Ed’s assignment desk: Somebody with artistic talent (i.e., not me) should create a “playsmaybe” logo, perhaps depicting a square peg labled “playsmaybe” failing to fit into a round hole labeled “DRM in use”.]

Balancing Tests in the Grokster Briefs

The biggest issue in the Grokster case is whether the Supreme Court adjusts or clarifies its precedent from the Sony Betamax case. The fate of Grokster itself is much less important than what ground rules the Court imposes on future innovators.

The core of the Betamax opinion is this oft-quoted passage:

The staple article of commerce doctrine must strike a balance between a copyright holder’s legitimate demand for effective – not merely symbolic – protection of the statutory monopoly, and the rights of others freely to engage in substantially unrelated areas of commerce. Accordingly, the sale of copying equipment, like the sale of other articles of commerce, does not constitute contributory infringement if the product is widely used for legitimate, unobjectionable purposes. Indeed, it need merely be capable of substantial noninfringing uses.

There are two ideas here: the need to balance the interests of copyright holders against the interests of others, and, following from this need for balance, immunity from contributory infringement for devices sufficiently capable of noninfringing use. Grokster often argues from the immunity language. The studios often argue from the balance language, asserting that Grokster’s reading of the immunity language is inconsistent with the balance language. Many of the briefs filed on Monday take this latter angle.

What’s interesting is that most of those briefs, though relying heavily on balance arguments, seem to miss an important aspect of Betamax’s balance language. They do this by setting up a balancing test between the interests of copyright owners and the interests of Grokster. But that’s not quite the balance that Betamax is talking about.

The Betamax court would balance the interests of copyright holders against those of “others freely to engage in [noninfringing] areas of commerce.” Here “others” refers not only to the maker of the challenged product (here, Grokster) but to everybody who benefits from the product’s existence. This includes users who benefit from noninfringing uses of the product, musicians or publishers who use the product to disseminate their work, users who will benefit from not-yet-discovered uses of the product, developers of future noninfringing products who learn from seeing the product in operation, and so on. These benefits are often diverse, diffuse, and difficult to foresee, which is why the Betamax court was cautious about imposing liability for infant technologies.

I’ve read most of the briefs filed in Monday’s group. Of these, I’ve seen only three that seem to understand this point about what interests need to be balanced. These three come from the video store dealers; a group of professors (Kenneth Arrow et al.); and IEEE-USA. These briefs differ in their ultimate conclusions, which is not surprising. Understanding which interests need to be balanced is only a starting point for analysis.

Grokster Briefs: Toward a More Regulable Net

Many briefs were filed yesterday in Grokster, the upcoming Supreme Court case which has broad implications for technology developers. (Copies of the briefs are available from EFF.) There’s a lot to discuss in these briefs. Today I want to focus on two of the amicus briefs, one from the Solicitor General (who represents the U.S. government), and one from a group of anti-porn and police organizations.

The Solicitor General offers an odd discussion of P2P and the Internet’s history (pp. 2-3):

1. Peer-to-peer (P2P) computing technology enables users of a particular P2P network to access and copy files that are located on the computers of other users who are logged in to the network. Unlike traditional Internet transactions, in which a user’s computer obtains information from a specific website operated by a central computer “server,” P2P networking software gives users direct access to the computers of other users on the network. [Citation omitted.] P2P file-sharing software thus performs two principal functions: First, it searches for and locates files that are available on the various “peer” computers linked to the network, and second, it enables a user to retrieve and copy the desired files directly from such computers.

This history could hardly be more wrong. The ability to share files between any two computers on the network was an explicit goal of the Internet, from day one. The web is not a traditional aspect of the Internet, but a relatively recent development. And the web does not require or allow only large, centralized servers. Anybody can have a website – I have at least three. Searching for files and retrieving copies of files is a pretty good description of what the web does today.

What the Solitor General seems to want, really, is a net that is easier to regulate, a net that is more like broadcast, where content is dispensed from central servers.

The anti-porn amici come right out and say that that is what they want. Their brief uses some odd constructions (“Like any non-sentient, non-judgmental technology, peer-to-peer technology can be misused…”) and frequent recourse to the network fallacy.

Their main criticism of Grokster is for its “engineered ignorance of use and content” (p. 9; note that the quoted phrase is a reasonable definition of the end-to-end principle, which underlies much of the Internet’s design), for failing to register its users and monitor their activities (e.g., p. 13), for failing to limit itself to sharing only MP3 files as Napster did (really! p. 17), and for “engineer[ing] anonymous, decentralized, unsupervised, and unfiltered networks” (p. 18).

These arguments (as the lawyers say) prove too much, as they would apply equally to the Internet itself, which is ignorant of use and content, does not register most of its users or monitor their activities, does not limit the types of files that can be shared, and is generally anonymous, decentralized, unsupervised, and unfiltered.

What kind of net would make these amici happy? The Solicitor General speaks approvingly of LionShare, Penn State’s home-grown P2P system, which appears to register and log everything in sight. Of course, LionShare doesn’t fully exist yet, and even when it does exist it will not be available to the public (see LionShare FAQ, which says that the source code will be available to the public, but the public will not be allowed to share files with “authorized” academic users). For a member of the public who wants to share a legal, non-porn, non-infringing file with a wide audience, the Web, or Grokster, is a much better technology than LionShare.

These briefs are caught between nostalgia for a past that never existed, and false hope for future technologies that won’t do the job.

Why Hasn't TiVo Improved?

The name TiVo was once synonymous with an entire product category, Digital Video Recorders. Now the vultures are starting to circle above TiVo, according to a New York Times story by Saul Hansell. What went wrong?

The answer is obvious: TiVo chose to cozy up to the TV networks rather than to its customers.

When my family bought a TiVo, it was a cutting-edge product (the TiVo, not the family; but come to think of it, the family was pretty cool too), delivering a customer experience that was hard to find elsewhere. Since then, eight years have passed – an eternity in the electronics business – and TiVo is still selling essentially the same product. Sure, they have added a few bells and whistles, but nothing that made us want to run out and buy a new box.

TiVo made a decision, early on, to cozy up to the TV networks, to stay within their comfort zone. But the networks’ comfort zone is awfully confining. ReplayTV took a different path, seizing the technological lead with new features that angered the networks; and the networks brought a lawsuit that ReplayTV couldn’t afford to defend. At the time, TiVo execs probably chuckled and congratulated themselves for their caution.

Now the time has come for TiVo to pay for its timidity. Its technology is no longer distinctive, and the rising tide of DRM threatens to cut TiVo’s products out of the TV delivery pipeline. (Remember, DRM is just another name for deliberate incompatibility.) It’s not clear what the company will have to offer future customers.

Which brings us to the key paragraph in the New York Times story:

Last week, TiVo announced that Mr. Ramsay was stepping down as chief executive but would remain as chairman. He said the change was his idea and had been under discussion for months. Several board members and others close to the board confirm that. But they also said that the board hoped to hire someone with less of Mr. Ramsay’s fierce belief in the power of TiVo’s technology. They said they preferred someone with an ability to repair TiVo’s relations with the big cable companies.

[italics added] As in so many organizations, TiVo’s response to crisis is to do more of what got them in trouble, rather than returning to the strategy that made them successful in the first place.

This is bad news for TiVo, which desperately needs new, distinctive technology if it wants to survive. It’s bad news for customers too.

UPDATE (2:00 PM): Matt Haughey has a nice response over at PVRblog.

Network Monitoring: Harder Than It Looks

Proposals like the Cal-INDUCE bill often assume that it’s reasonably easy to monitor network traffic to block certain kinds of data from being transmitted. In fact, there are many simple countermeasures that users can (and do, if pressed) use to avoid monitoring.

As a simple example, here’s an interesting (and well known) technical trick. Suppose Alice has a message M that she wants to send to Bob. We’ll treat M as a number (bearing in mind that any digital message can be thought of as a number). Alice chooses a random number R which has the same number of digits as M. She sends the message R to Bob; then she computes X = M-R, and sends the message X to Bob. Obviously, Bob can add the two messages, R + (M-R), and the sum will be M – the message Alice originally wanted to send him.

[Details, for mathematical purists: all arithmetic is done modulo a large prime P; R is chosen randomly in [0, P-1]. When I say a value “looks random” I mean that it is indistinguishable (in the information-theoretic sense) from a random value.]

Now here’s the cool part: both of the messages that Alice sends look completely random. Obviously R looks random, because Alice generated it randomly. But it turns out that X looks random too. To be more precise: either message by itself looks completely random; only by combining the two messages can any information be extracted.

By this expedient, Alice can foil any network monitor who looks at network messages one at a time. Each individual message looks innocuous, and it is only by storing messages and combining them that a monitor can learn what Alice is really telling Bob. If Alice sends the two messages by different paths, then the monitor has to gather messages from multiple paths, and combine them, to learn what Alice is telling Bob.

It’s easy for Alice to extend this trick, to split her message M into any number of pieces. For example, Alice could split M into five pieces, by generating four random numbers, R1, R2, R3, and R4, and then computing X = M-(R1+R2+R3+R4). Given any four of these five pieces, nothing can be deduced. Only somebody who has all five pieces, and knows to combine them by addition, can extract information. So a monitor has to gather and compare many messages to see what Alice is up to, even though Alice isn’t using encryption.

There are many more technical tricks like this that are easy for Alice and Bob to adopt, but hard for network monitors to cope with. If the monitors want to engage in an arms race, they’ll lose.