Difference between PPS, PPS EXS & PPS No Trial

[TheWorkingMan]

Can somebody explain to me what the difference between these are?

I see different forms in NATS, and although I get the PPS and PPS No Trial concepts, the "PPS EXS" I never heard of.

Could anyone clarify this?

Thanks in advance!

[Bangomans]

Some of ad network use their own pharse with offer, so better to ask them directly.

May be it is kind of how many months, premium user will stay on that site . Not sure buddy. Sorry!