Condition database includes non-event-related information (Alignment, Calibration, Temperature, etc.) and parameters for simulation/reconstruction/analysis software.
These files are needed when running a CMSSW job on the open data environment (VM or container), and they are available in the /cvmfs/cms-opendata-conddb.cern.ch file system. They are automatically read from /cvmfs/cms-opendata-conddb.cern.ch/76X_dataRun2_16Dec2015_v0.db runtime.
76X_dataRun2_16Dec2015_v0 is for the full event range of both for RunC and RunD 2015 collision data.
See further information in the guide to CMS condition database.
For condition data to be used with 2015 CMS simulated datasets see:
The open data are released under the Creative Commons CC0 waiver. Neither CMS nor CERN endorse any works, scientific or otherwise, produced using these data. All releases will have a unique DOI that you are requested to cite in any applications or publications.