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/START42_V17B runtime.
START42_V17B is to be used with the simulated data.
See further information in the guide to CMS condition database.
For 2010 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.