Lock Posts
This plugin allows site admin to lock down posts on any blog so that regular ol' users just can't edit them - for example, with a school assignment - stop it from being edited after submission.
Start by reading Installing mu-plugins section in our comprehensive WordPress MU Manual if you are new to WordPress MU.
To install:
1. Download the plugin file
2. Unzip the file into a folder on your hard drive
Upload lock.post.php to wp-content/mu-plugins/

3. Upload locked.php to wp-admin

To use:
- Log in as site admin user.
- Go to the post you want to lock and click on 'Edit' ( Posts > Edit )
- Scroll down to Post Status area and select Locked
- Click Update Post
