change or remove password on bootup
Yes, it's file vault.

To remove file vault protection:

1) Choose Apple menu > System Preferences, click Security &amp; Privacy, and then click FileVault.
2) Click the lock to unlock the preferences pane, and then enter an administrator name and password.
3) Click Turn Off FileVault.
4) Click Turn Off Encryption.  

Then if you want to re-enable it, you can choose your own password.