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    About DMOZ
    Since 1998, DMOZ has been the largest, most comprehensive human-edited directory of the Web. Supported by AOL, it is constructed and maintained by a passionate, global community of volunteer editors.
    Sep 3rd 2009 2:43PM
    How is DMOZ Data Used?
    A lot of our blog posts are dedicated to exploring the internal workings of the directory or the way in which DMOZ grows, but we don't often talk about how the data is used once it's included in the directory. While the stand-alone DMOZ directory is an excellent resource, many of the information-seekers who benefit from directory content come into contact with it through third-party sites that use the data.

    You may have heard DMOZ called by another name – the Open Directory Project, or ODP. This is where the "Open" comes in. The DMOZ license agreement states that users may download the RDF – in other words, the entire contents of the directory – and use some or all of it on their sites free of charge. Many sites both large and small incorporate data compiled by our dedicated corps of volunteer editors. The best-known example of this may be the Google Directory which applies Google's propriety PageRank data to DMOZ results. In other cases, site owners use a small portion of the data relevant to their own regions, localities or lines of business.

    In exchange for use of the data, site owners agree to include an attribution badge to ensure that the editors get credit for the work they do to build and maintain the directory. The badge is also important in that it allows interested users to learn more about the project and, potentially, to decide to join us as editors to help it grow. There are some fairly common questions about how and when the badge must be displayed. Examples include:

    1. I am only using a very small portion of the data – just one category, or even just a few links. Do I have to display the badge?
    Yes. You may use all or part of the directory data on your site, but any quantity of ODP data (large or small) you select must be acknowledged with the badge.

    2. I am including my own data in addition to DMOZ data. Do I have to display the badge?
    Yes. The license's badging requirement also applies to any derivative works created by end users.

    3. I run my own directory and accept my own site submissions in addition to the DMOZ-listed sites. Do I have to display the badge?
    Yes. The rules here are the same as with any other derivative work.

    4. Are there any circumstances in which I can use data and not display the badge?
    The short answer is no. Any use of DMOZ data must be acknowledged in accordance with the license.

    Sites that do not display the badge are in violation of the license agreement. Site owners may be contacted by DMOZ and asked to make the appropriate updates in order to comply.

    You can read more about the DMOZ license requirements here and download a code snippet to add the badge to your site here.
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