Q:

SQL Server BAK file with protection is beaten by SA user? 

In my work I have a BAK file (which I'm working on in SSMS) and the system Admin gave me permissions via my Active directory . 
NOw , 
If I'm taking the bak to another place (e.g. home), and I'm adding the sa user (which is me, and I don't have Server Environment in my house) as full controller.  
Should I be able to have full control over it (at home )? 

A:

If you have a backup file with no encryption, then you can restore it on your local machine as sa.   When you do this, though, the database users will be orphaned, and you will have to modify that.   No big deal, and as an sa you'll already be mapped to the dbo user, but if you have an application hitting the database using a different database login/user then that will be an issue. 