invinceable 0 Newbie Poster

Ok, I have almost finished developing a program, but I have decided I want to license it by the month. Is there something similar to amember http://www.amember.com/p/ that is available for client side development?

Ideally I want to charge users say like $17/month to go ahead and use my program, and if the user does not pay, a licensing back end will shut off access to the program.

I could program my own sort of system, but would rather go ahead and use something that is ready made or buy some sort of solution.

Any advice is greatly appreciated.