Sitefinity enables you to hide any number of widgets from the toolbox on back-end pages from specific users, based on their user roles. Thus, these users do not see the widgets in the toolbox and do not use them.
A new how-to article is designed to help you set up a back-end configuration section where administrators can determine if certain roles are allowed to see certain widgets.
The sample and more information could be found in our Sitefinity documentation on the following link.