Customer want to disable the software channel on satellite server. Currently we have option in satellite called "Globally Subscribable:" on channel details page, if we disable the checkbox for specific channel then non channel admin users are not able to subscribe new systems to this channel. But if we use activation key created my channel administrator (who has access to this channel) to register the system then new systems get registered to channel. 

So customer want feature that if we disable any channel then channel content should be intact but new systems should not get registered to this channel by any way of registration and same channel should be unavailable for systems which are already registered to the channel.
This event sent from IssueTracker by jwest  [SEG - Feature Request]
 issue 294933

We are closing this as a WONTFIX but there are facilities built into Satellite 6 that support controlling access via our Roles Based Access Control mechanism such that you can indicate if a user should or should not have access to specific repositories managed on the Satellite.

You can subscribe systems to a Content View in Satellite 6 which is a 'view' into a series of repositories.  You can then add/remove specific repositories from this view which will grant and deny systems using the view access to that repository.

This requires no changes on the system side and can be used to virtually disable/enable repositories.