How to automate illegal content detection on the internet?​


  • The RRT hotline ( receives and investigates reports on prohibited content found on the Internet (child sexual abuse material (CSAM), pornography, etc.).The purpose of the hotline is to remove prohibited content as quickly as possible.​

  • In 2019, 998 notifications were received using the internet hotline in Lithuania (302 of the notifications were confirmed as related to CSAM and pornography). Overall, CSAM discovery online is increasing. In 2018, 223 999 such images were registered by the INHOPE organisation. 

  • At the moment, only messages received via the internet hotline are investigated and no proactive search for prohibited content is carried out.


RRT strives to protect internet users, especially children, by automating the identification of prohibited content placed on Lithuanian websites and servers.


The solution should:

  • Operate in the Lithuanian IP address range;​

  • Be able to identify websites operating in Lithuania;​

  • Be able to recognize prohibited visual material;​

  • Send a link (URL) of the detected prohibited visual material to the RRT hotline.

Why should

you participate?

  • If the solution is working properly, RRT is ready to start the procurement processes.

  • The Cybercrime Unit of the Lithuanian Criminal Police Bureau supports the development of such a solution and will provide consultations and CSAM hashes to increase the quality of the solution.

The solution could also be adapted to:​

  • hotlines in other countries;​

  • other bodies (e.g. police) investigating reports of possible other illegal activities in the cyberspace.

Additional information

You can find more detailed challenge description here

(EN & LT):


If you have other questions about the process, participation, deadlines, or anything related to GovTech Challenge Series 2.0, please contact us by email

Task owners

​Communications Regulatory Authority / Digital Services Department

Challenge video

You can find video of the challenge presentation (in Lithuanian) below: