SEP - IPSDefs folder keeping definitions

Hi,

I found in this folder : Chenage for whatever SEP version as -SEPVersionNumber12345-

C:\ProgramData\Symantec\Symantec Endpoint Protection\SEPVersionNumber12345\Data\Definitions\IPSDefs

In several versions including the latest, the IPSDefs folder keep the old definitions, not deleting after new one is installed.

I wonder if is needed and why SEP is not able to delete the previous ones.

Looks like the only needed definition is the last one, avalaible in:

https://www.symantec.com/security_response/definit...

Example list :

07/04/16  04.58    <DIR>          20160406.011
08/04/16  05.09    <DIR>          20160407.011
09/04/16  06.17    <DIR>          20160408.011
12/04/16  08.31    <DIR>          20160411.011
13/04/16  09.31    <DIR>          20160412.011
14/04/16  10.38    <DIR>          20160413.011
15/04/16  10.46    <DIR>          20160414.011
16/04/16  11.45    <DIR>          20160415.011
19/04/16  13.59    <DIR>          20160418.011
20/04/16  03.07    <DIR>          20160419.011
21/04/16  04.11    <DIR>          20160420.011 

Thanks,