4.0 Pu.suit: Can "permissions" be set on a date when it runs out?

[محروم.كوم]

Hello,
I would like to know (alot) more about the permission systems, so if you could direct me to a more indepth reading I would be most thankfull. I will also try to describe what I am after;

I would like have the option to make a person/member into a subscriber.
As long as that person/member has a subscription, s/he will have access to certain articles, forumsections etc.
I am pretty sure one has alot of otions with the help of your "group" system.
This is possible with alot of manual work, but with alot of members/subscribers it will be a full time job just to keep track of that.

The thing I wonder is if it's possible to "tag" a group/person for a certain amount of time the subscription will be valid and after the time runs out that person/group will loose all their subscription rights automatically. __DEFINE_LIKE_SHARE__