Membership Needs one Category Content Free to non subscribers

Our client has been using the membership software and would like to enable all of their categories to be visible and when they click the “read more” button they are re-directed to the subscription page. With the exception of the Legal Notices as they are a paper and this information must be free and accessible to all users. How can we make this content available to non subscribers and still restrict the content for the “read more” posts on the other categories.