Remove permissions from page or space. A permission of @all can be used. For page permissions, use space and title or page id. Valid page permissions are: [View, Edit]. Valid space permissions are: [VIEWSPACE, REMOVEOWNCONTENT, EDITSPACE, REMOVEPAGE, EDITBLOG, REMOVEBLOG, CREATEATTACHMENT, REMOVEATTACHMENT, COMMENT, REMOVECOMMENT, SETPAGEPERMISSIONS, REMOVEMAIL, EXPORTSPACE, SETSPACEPERMISSIONS]. Group or userId can also be a comma separated list of groups and users.