CBR is a comic book achieves file extension. It contains comics in compressed format. It uses the data compression technique of RAR archive files. CBR is a modification of RAR file. It can also be opened with WinRAR achieve viewer. The basic difference between RAR and CBR is CBR can be opened on comic book viewing software also.
PDB is an eBook or database format used in the Palm OS platform. PDB files support royalty free eBooks because it does not provide Digital Rights Management (DRM). PDB supports the basic eBooks with basic format. It is used in Palm devices.
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