Geosearch / Live Stats / Bug Report / FAQ / About LinkedCT

Is LinkedCT's data Open?

Yes. First, you need to follow the original source's Terms and Conditions. LinkedCT data is published under Creative Commons Attribution 4.0 International License, which means you are free to:
  • Share — copy and redistribute the material in any medium or format
  • Adapt — remix, transform, and build upon the material
  • for any purpose, even commercially - under the following condition:
  • Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • With the understanding that: permissions beyond the scope of this public license are available at

    Refer to this page and this page for more details.

    How up-to-date is the data?

    A script is always running in the background to keep the data fresh. However, this doesn't mean that the data is up-to-date at all times. There might be a delay until our system gets notified about new trials or changes in the old trials. This delay might be a few seconds or a few days (or even weeks). On average, it will take less than a day for the new trials to show up, but the update process might be slower simply because it takes longer to identify a change, but we can instantly find out if there are new trials made available on

    What happened to the (old) static LinkedCT?

    It is still available, for a limited time, at You can always download previous data dumps here.

    Can I download all the data?

    You can only download static data dumps made available here. We will do our best to have a new dump at least every three months. If the available dumps are not up-to-date enough for your particular application, please kindly send us an email and ask for fresh data dumps.

    I have been issuing a lot of queries to LinkedCT's server, but now I cannot access the server anymore. What is wrong?

    We have a small server hosting a large amount of data. We expect the users to issue queries responsibly, otherwise we unfortunately have to block their IP addresses. If you think we have blocked your IP address by mistake, send us an email and we will fix it. Please have in mind that the project is still in its preview phase and we might have short, temporary down times. Contact us only if the data is not accessible for a long period of time (say a few hours).

    If you need to issue a lot of (expensive) queries in your application, we highly recommend that you download the latest data dump and load it onto your own local triplestore.

    If you really need the live databrowse interface and SPARQL endpoint for regular use and possibly expensive queries, and you can afford to pay for a virtual server, drop us an email and we might be able to set up a custom more powerful server for you.

    Is the SPARQL endpoint working properly?

    Please see Issue #2. Richard Boyce from University of Pittsburgh has kindly provided an extra SPARQL endpoint powered by OpenLink Virtuoso.