how reputation score is calculated and shared with SEP

Hi,

I have SEP installed in my enviornment.  I would like to understand how files are considered good, bad, suspicious. How reputation score is calculated and shared with SEP. Does SEP have some database withn it and goes to reputation database only in case new file is received and if yes, where does it store inforation for old files.

Where is the hash of file calculated and is that the driving mechanism for scoring.

Thanks