John James Jacoby

Stuttter

Prevent categories, tags, and other taxonomy terms from being edited or deleted
WP Term Locks allows administrators to lock taxonomy terms from being edited or deleted by other capable users
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WP Term Locks

Prevent categories, tags, and other taxonomy terms from being edited or deleted

Bryan Petty

Disables automatic post locking so multiple users can open the same post in 
the administration panel.
Warning: Post locking was an addition to WordPress in order to prevent such 
bugs as overwritten autosaves (coming from multiple authors), and of course 
to prevent accidentally overwriting another user’s changes with older content. 
These are often never problems for many users, and you should likely be 
communicating with your fellow editors when making changes anyway. This plugin 
makes the choice of relying on the latter rather than post locking, so you 
may run into those problems again.

Disable Post Locking

Disables automatic post locking so multiple users can open the same post in the administration panel.

WP Term Locks vs Disable Post Locking