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Just set them to private in the database, using the following query:
UPDATE `wp_posts` SET `post_status` = 'private';
This would set all posts to private, I guess you won’t really use that query.
Instead, to only set articles to ‘private’ use:
UPDATE `wp_posts` SET `post_status` = 'private' WHERE `post_type` = 'post';
and to only disable pages, use:
UPDATE `wp_posts` SET `post_status` = 'private' WHERE `post_type` = 'page';
Post-revisions have the status ‘inherit’ and thus get the right inherited from the parent page or article.