d553fd3e_soft_Access_Security_Apparatus__he_main_topic_of_this_article_
[Users, Groups, Permission] Code/database signing
Like other Office applications, Access 2003 debuted increased paranoia about malicious code. To allow running with a "Macro Security" level other than Low, you can digitally sign your VBA projects (maybe the entire database?). My personal view is that the Office approach to code signing is such a shambles that it's only worth hassling with this if there's a serious potential of accidentally running malicious Access databases. This topic is not covered further in this article.
The Microsoft Access Security Apparatus
"User-level security" or "Workgroup-file-based security": Governing who is permitted to view, add, edit and delete database objects (tables, queries etc), and to edit those permissions for other users. This is the main topic of this article.