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/FT53_V21A_AN6_FULL runtime.
FT53_V21A_AN6_FULL is for the full event range for 2012 and can be used both for RunB and RunC 2012 collision data. Databases for limited event ranges are also available under /cvmfs/cms-opendata-conddb.cern.ch (FT53_V21A_AN6 is for the event range of RunB and FT53_V21A_AN6_RUNC for the event range of RunC).
See further information in the guide to CMS condition database.
For 2012 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.