Igor Golovanov

WP Term Metadata Plugin for retrieving and manipulating metadata of term objects. Metadata for 
an object is a represented by a simple key-value pair. Objects may contain multiple metadata 
entries that share the same key and differ only in their value.
= Plugin provides new API functions:
<ul>
<li>add_term_meta() – Add meta data field to a term.</li>
<li>delete_term_meta() – Remove meta data matching criteria from a term.</li>
<li>get_term_meta() – Retrieve term meta field for a term.</li>
<li>
update_term_meta() – Update term meta field based on term ID.
</li>
<li>
add_term_taxonomy_meta() – Add meta data field to a term based on taxonomy name.
</li>
<li>delete_term_taxonomy_meta() – Remove meta data matching criteria from a term based on taxonomy name.</li>
<li>get_term_taxonomy_meta() – Retrieve term meta field for a term based on taxonomy name.</li>
<li>update_term_taxonomy_meta() – Update term meta field based on term ID and taxonomy name.</li>
</ul>

WP Term Metadata

WP Term Metadata Plugin for retrieving and manipulating metadata of term objects.

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
<h4>Also checkout</h4>
<ul>
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<li><a href="https://wordpress.org/plugins/wp-term-order/" title="Sort taxonomy terms, your way." rel="ugc">WP Term Order</a></li>
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<li><a href="https://wordpress.org/plugins/wp-term-locks/" title="Pretty locks for categories, tags, and other taxonomy terms." rel="ugc">WP Term Locks</a></li>
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<li><a href="https://wordpress.org/plugins/wp-user-activity/" title="The best way to log activity in WordPress." rel="ugc">WP User Activity</a></li>
<li><a href="https://wordpress.org/plugins/wp-user-avatars/" title="Allow users to upload avatars or choose them from your media library." rel="ugc">WP User Avatars</a></li>
<li><a href="https://wordpress.org/plugins/wp-user-groups/" title="Group users together with taxonomies & terms." rel="ugc">WP User Groups</a></li>
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</ul>

WP Term Locks

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

WP Term Metadata vs WP Term Locks