Pause/Hold on course

Hello,

I realized a new issue with my students.
Are there possibility to pause a user in a course?
I mean:
I use the content drip module. Users receive the new lessons every monday and they pay for them every 4th week.
If a user decides to hold on the course e.g. by the 20th lesson of a 40 lesson long course (he/she will continue it after a while), how can we give access to all lessons before 20, but not accessible from lesson 21?
Hopefully it’s clear what I wanted to say. ??

Thank you in advence!