OG Content Access provides the ability to rely on group-specific roles for providing (view/load) access to specific content.
The use-case is as follows: you have a group with several content types - blog, announcements, file downloads.
Any members of that group will automatically have access to view any of the above contents. You can control access to create, delete, and edit
content for different roles, yes, but every member will ALWAYS have access to view all of the contents of a group.
With this module you can restrict viewing each content to different members by setting the role which is allowed to view/access each content
and then, within the group context you may assign roles as necessary for each member.