swresample-0.dll is said by norton 'access allowed' and 'reputation level good' but online search says it's malware

swresample-0.dll is said by norton 'access allowed' and 'reputation level good' but online search warns of malware. this forum has old 2011 mentions of that but today, 10/30/15, norton says otherwise and online searches still warn of malware.  i have had no problems with flash video downloader thru mozilla firefox. ?????what should i believe????