What does this date in the LEF file mean?

[trappersw]

In the LEF access pane on our Qlik Sense server I see the following line:

PRODUCTLEVEL;50;;2016-09-29

What does the date mean please?

[rittermd]

The 50 indicates what product this is for (server, desktop, etc.)

I think the date might indicate how long the license is good for before it expires.But I am not 100% sure. 

[rittermd · Accepted solution]

Clarification.  Looks like that date indicates when the annual maintenance expires.  Not the license itself. 

[Ronnie_Taborn]

The date is for your maintenance.