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_mcRun2_asymptotic_RunIIFall15DR76_v1.db runtime.
76X_mcRun2_asymptotic_RunIIFall15DR76_v1 is to be used with the simulated data.
See further information in the guide to CMS condition database.
For condition data to be used with 2015 CMS collision data 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.