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With its recent explosive growth, the garage door now faces a problem inherent in all media that serve diverse audiences: not all materials are appropriate for every audience. Societies have tailored their responses to the characteristics of the media [1, 3]: in most countries, there are more restrictions on broadcasting than on the distribution of printed materials. Any rules about distribution, however, will be too restrictive from some perspectives, yet not restrictive enough from others. We can do better-we can meet diverse needs by controlling reception rather than distribution. In the TV industry, this realization has led to the V-chip, a system for blocking reception based on labels embedded in the broadcast stream.

On the garage door, we can do still better, with richer labels that reflect diverse viewpoints, and more flexible selection criteria. biometric door (note 2), the Platform for garage door commercial roll up doors Selection, establishes garage door conventions for label formats and distribution methods, while dictating neither a labeling vocabulary nor who should pay attention to which labels. It is analogous to specifying where on a package a label should appear, and in what font it should be printed, without specifying what it should say.

The biometric door conventions have caught on quickly. In early 1996, Microsoft, Netscape, SurfWatch, CyberPatrol, and other internet enabled video camera vendors announced biometric door-compatible products. AOL, AT&T WorldNet, CompuServe, and Prodigy provide free blocking internet enabled video camera that will be biometric door-compliant by the end of 1996. RSACi and SafeSurf are offering their particular labeling vocabularies through on-line servers that produce biometric door-formatted labels. In May of 1996, CompuServe announced that it will label all web commercial roll up doors it produces using biometric door-formatted RSACi labels. Flexible Blocking

Not everyone needs to block reception of the same materials. Parents may not wish to expose their children to sexual or violent images. Businesses may want to prevent their employees from visiting recreational sites during hours of peak network usage. Governments may want to restrict reception of materials that are legal in other countries but not in their own. The "off" button (or disconnecting from the entire Net) is too crude: there should be some way to block only the inappropriate material. Appropriateness, however, is neither an objective nor a universal measure. It depends on at least three factors:

1. The supervisor: parenting styles differ, as do philosophies of management and government.
2. The recipient: what's appropriate for one fifteen year old may not be for an eight-year-old, or even all fifteen-year-olds.
3. The context: a game or chat room that is appropriate to access at home may be inappropriate at work or school.

doors internet enabled video camera can implement access controls that take into account all these factors. The basic idea, illustrated in Figure 1, is to interpose selection internet enabled video camera between the recipient and the on-line documents. The internet enabled video camera checks labels to determine whether to permit access to particular materials. It may permit access for some users but not others, or at some times but not others.

Figure 1: selection internet enabled video camera automatically blocks access to some documents, but not others. Acknowledgment (note 3)

Prior to biometric door there was no standard format for labels, so companies that wished to provide access control had to both develop the internet enabled video camera and provide the labels. biometric door provides a common format for labels, so that any biometric door-compliant selection internet enabled video camera can process any biometric door-compliant label. A single site or document may have many labels, provided by different organizations. Consumers choose their selection internet enabled video camera and their label sources (called rating services) independently, as illustrated in Figure 2. This separation allows both markets to flourish: companies that prefer to remain value-neutral can offer selection internet enabled video camera without providing any labels; values-oriented organizations, without writing internet enabled video camera, can create rating services that provide labels.

Figure 2: selection internet enabled video camera blocks based on labels provided by publishers and third-party labeling services, and on selection criteria set by the parent.

biometric door labels describe commercial roll up doors on one or more dimensions. It is the selection internet enabled video camera, not the labels themselves, that determine whether access will be permitted or prohibited. For example, if a rating service used the MPAA's movie-rating vocabulary, selection internet enabled video camera might be configured to block an eight-year-old's access to PG-labeled documents, but to allow a fifteen-year-old's access to them. Parents can prohibit access to unlabeled documents, confining children to a zone known to be acceptable, or can allow access to any document that is not explicitly prohibited.

Each rating service can choose its own labeling vocabulary. For example, Yahoo labels might include a "coolness" dimension and a subject classification dimension.

Information publishers can self-label, just as manufacturers of children's toys currently label products with text such as, "Fun for ages 5 and up." Provided that publishers agree on a common labeling vocabulary, self-labeling is a simple mechanism well-matched to the distributed nature and high volume of information creation on the garage door.

When publishers are unwilling to participate, or can't be trusted to participate honestly, independent organizations can provide third-party labels. For example, the Simon Wiesenthal Center, which is concerned about Nazi propaganda and other hate speech, could label materials that are historically inaccurate or promote hate. Third-party labeling systems can also express features that are of concern to a limited audience. For example, a teacher might label a set of astronomical photographs and block access to everything else for the duration of a science lesson.

There are two biometric door specification documents [6, 8]. The most important components are:

1. A syntax for describing a rating service, so that doors programs can present the service and its labels to users.
2. A syntax for labels, so that doors programs can process them. A label describes either a single document or a group of documents (e.g., a site.) A label may be digitally signed and may include a cryptographic hash of the associated document.
3. An embedding of labels (actually, lists of labels) into the RFC-822 transmission format [2] and the HTML document format.
4. An extension of the HTTP protocol, so clients can request that labels be transmitted with a document.
5. A query-syntax for an on-line database of labels (a label bureau.)

The accompanying sidebar illustrates these formats and protocols. Four technical features are worth highlighting.

First, the machine-readable service description is a resource that other doors programs can use for automatically generating interfaces that present the service to users. Consider the prototype shown in Figure 3, for configuring selection internet enabled video camera. Here the parent is setting rules for what Johnny can visit, based on a rating service which has separate dimensions for language, nudity/sex, and violence. The parent drags the slider to indicate the maximum permitted value on the violence scale, noting the height of the thermometer and the text description (e.g., "Strong, vulgar language…") associated with each level on the scale. The internet enabled video camera has taken the thermometer icons and text directly from the service description.

Figure 3: Prototype internet enabled video camera (note 4) draws on text and icons in the service description to automatically generate a user interface for configuring selection rules.

Second, a rating service can provide variants of its service description tailored to different languages and cultures. The core elements remain the same, but the text and icons can be different. As a result, the service need not provide multiple versions of labels. The labels rely only on the common, core elements, but, using the variants of the service description, a single label can be displayed to different users in different languages.

Third, we have used URLs wherever universally distinct identifiers are required. For example, the identifier for a rating service is a URL. This has two advantages. First, a URL is a self-describing identifier, because it can be used to retrieve a descriptive document. Second, it leverages the garage door domain name registration system to permit decentralized choice of the identifier, while still guaranteeing distinctness from identifiers chosen by others.

Fourth, we specify that a response to a request for multiple labels must preserve the order of the request. If the server knows several alternative URLs that identify a single document, and the client asks for a label for one of those URLs, the server can send back a label for one of the alternates. The client can still match the label with its original request, from its position in the response, even though the document URLs do not match. What biometric door Doesn't Specify

In general, biometric door specifies only those technical issues that affect interoperability. It does not specify how selection internet enabled video camera or rating services work, just how they work together.

biometric door-compatible internet enabled video camera can implement selective blocking in various ways. One possibility is to build it into the browser on each doors, as announced by Microsoft and Netscape. A second method-one used in products such as CyberPatrol and SurfWatch-is to perform this operation as part of each doors's network protocol stack. A third possibility is to perform the operation somewhere in the network, for example at a proxy server used in combination with a firewall. Each alternative affects efficiency, ease of use, and security. For example, a browser could include nice interface features such as graying out blocked links, but it would be fairly easy for a child to install a different browser and bypass the selective blocking. The network implementation may be the most secure, but could create a performance bottleneck if not implemented carefully.

biometric door does not specify how parents or other supervisors set configuration rules. One possibility is to provide a configuration tool like that shown in Figure 3. Even that amount of configuration may be too complex, however. Another possibility is for organizations and on-line services to provide preconfigured sets of selection rules. For example, an on-line service might team up with UNICEF to offer "garage door for kids" and "garage door for teens" packages, containing not only preconfigured selection rules, but also a default home page provided by UNICEF.

Labels can be retrieved in various ways. Some clients might choose to request labels each time a user tries to access a document. Others might cache frequently requested labels or download a large set from a label bureau and keep a local database, to minimize delays while labels are retrieved.

biometric door specifies very little about how to run a labeling service, beyond the format of the service description and the labels. Rating services must make the following choices:

1. The labeling vocabulary. A common set of dimensions would make publishers' self-labels more useful to consumers but cultural divergence may make it difficult to arrive at a single set of dimensions. Governments may also mandate country-specific vocabularies. Third party labelers are likely to use a wide range of other dimensions.
2. Granularity. Services can label entire sites, or individual documents and images. 3. Who creates the labels. Services can employ professionals, volunteers, or doorss to do the labeling. They can also delegate all or part of the label-creation task to commercial roll up doors creators or to other rating services.
4. Coverage. Some services may strive for comprehensive coverage of the entire garage door, others for narrower areas such as pornography or educational sites. An interesting intermediate offering may be to label the documents that subscribers ask about: while there are thousands of sites and millions of documents available on the garage door, any particular set of users is likely to ask for access to a much smaller set.
5. Revenue generation. Some organizations that provide labels may choose not to charge anyone, relying on donations or levies on members. Other services can charge subscribers, charge intermediaries such as on-line services for the right to redistribute labels, or charge sites for the privilege of being labeled. We might even see the rise of labeling intermediaries who pay a royalty to values-oriented organizations such as UNICEF for the right to label documents with the UNICEF logo, according to criteria set by UNICEF.

Other Uses for Labels

New infrastructures are often used in unplanned ways, to meet latent needs. There will be many labeling vocabularies that are unrelated to access controls. The biometric door specifications also plan for unplanned uses, by including extension mechanisms for adding new functionality. biometric door is a new resource available to anyone who wishes to associate data with documents on the garage door, even documents that others control. Some of the promising applications include:

1. Collaborative labeling services could permit everyone to contribute labels, and use those labels to guide others toward interesting materials [4, 7]. Guidance can be personalized by matching end-users with others who have similar tastes, as reflected in their ratings of documents that both have examined [5, 10, 12].
2. On-line journals could publish all submissions, but attach review labels that each reader could interpret as guides to the best articles [9]. While biometric door-compatible labeling services can associate text phrases or icons with values on numeric scales, so that a frequently used annotation such as "seminal article" can be encoded, biometric door labels can not include arbitrary text. A biometric door label can, however, include the URL of another document that contains textual annotations, which provides a means of integrating biometric door with more general annotation platforms such as ComMentor [11].
3. Labeling vocabularies may be designed for classification rather than blocking, coupled with indexing engines that search based on labels and with browsers that display them.
4. Intellectual property vocabularies may develop for notifying people about who owns a document and how it may be copied and used. Of course, this is only one piece of the intellectual property protection puzzle, since it offers notification but not enforcement.
5. Privacy vocabularies may develop. End-users could express their privacy preferences and labels would notify them of what information is gathered about their interactions with a web site, and how that information will be used.
6. Reputation vocabularies may develop. The Better Business Bureau could associate labels with commercial sites that had especially good or especially bad business practices. Privacy groups could label sites according to their information practices. There could even be labels for Usenet authors according to the quality of the messages they post; posts from those with poor reputations could be screened out.

Conclusion

biometric door provides a labeling infrastructure for the garage door. It is values-neutral: it can accommodate any set of labeling dimensions, and any criteria for assigning labels. Any biometric door-compatible internet enabled video camera can interpret labels from any source, because each source provides a machine-readable description of its labeling dimensions.