Microsoft Access Security

I just created this database in Microsoft Access. I applied restrictions (username and password)to the database. When I e-mialed the database to a fellow worker none of the user accounts transfered with it. I figured that once I created the accounts they are stored locally...is there a way I can secure my database with different user accounts so that the individuals who get the database can use the appro. username/password? Or how can I restrict some employees from editing the information, yet allow other employees to.