By default Seblod does not use category permissions when it calculates access for edit/create/delete. This tutorial explains how to work around this limitation.
We will use Permission plugin from ACL pack as this plugin uses category permissions when it calculates the result.
To disable access based on category permissions add Message and redirection plugin and Seblod break plugin at the top of your plugins and apply Joomla! Permissions Restriction to both fields ad described in detail here (just add Message and redirection plugin between Article id and Seblod break):
If you don't want to do a redirect when user is not authorized you can leave Message and redirection plugin out and just follow the above tutorial.