Hi Gabriella,
When an instance of CODAP is started from https://codap.concord.org/releases/*, user activity is logged to a Concord Consortium log server. Access to the log server is restricted. So for, to my knowledge, the data on the server has been exclusively used by Concord Consortium-affiliated researchers.
It is possible to configure a server instance of CODAP to send log messages to another server. This entails editing of a small configuration file co-resident with the CODAP code instance on the server. (CODAP is normally accessed at https://codap.concord.org/releases/latest), but it is open source software and zip archives of every build of CODAP are available at https://codap.concord.org/releases/zips that are installable on any standard web server.)
Hope this helps.
Jonathan