Starfleet Access Levels and, Starfleet Security Clearnence Levels

All Starfleet data is regulated. A set of access levels have been programmed the computer cores of all ships and starbases in order to stop any undesired access to confidential data.
The following shows the levels:

Level 1:
Limited access to Starfleet or Federation documents and records. Access is limited to job related elements.

Level 2:
Limited access to all Starfleet or Federation documents and records. Access is limited on a 'need to know' basis.

Level 3:
Limited access to all Classified and Secret Starfleet or Federation documents and records. Access is limited on a 'need to know' basis.

Level 4:
Limited access to all Classified, Secret, Top-Secret Starfleet or Federation documents and records. Access is limited on a 'need to know' basis.

Level 5
Unlimited access to all Classified, Secret, Top-Secret, Ultra-Secret Starfleet or Federation documents and records.

The following shows the assignments access levels:

Level 1:
All personnel and Civilians in Starfleet service

Level 2:
All personnel in Operational Duties

Level 3:
Lieutenants, (S.G & J.G.) also certain specific personnel (duty related)

Level 4:
Captains, Commanders and certain specific personnel (duty related)

Level 5:
Flag Officers

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Starfleet's, LCARS computer system, is also regulated. A set of authorization codes have been programmed into the computer cores of all ships and starbases in order to stop any undesired access to the systems.
The following shows the Security Clearence Levels:

Delta-1:
Limited access to all ship's records, and computers. Access limited to job related functions.

Delta-2:
Limited access to all ship's records, systems, commands and computers. Access limited to duty related functions.

Beta-1:
Unlimited access to all ship's records, and computers. Limited access to command functions (unless approved by the Commanding Officer). Access to ship systems is limited to duty related functions.

Alpha-1:
Unlimited access to all ship's records, systems and computers. No access to ship localized command functions.

Beta-2:
Unlimited access to all ship's records, systems and computers. Limited access to command functions (except if stated otherwise by Commanding Officer).

Alpha-2:
Unlimited access to all ship's records, systems, commands and computers. Unlimited access to ships localized command functions.

The following shows the assignments Security Clearence levels:

Delta 1:

Everyone

Delta 2:
Enlisted Officers & Warrant Officers

Beta 1:
Chief Science Officer, Chief Medical Officer & Chief Counselor

Alpha 1:
Chief Intelligence Officer

Beta 2:
Chief Operations Officer, Chief Security Officer, Chief Tactical Officer, Chief Flight Control Officer, Chief Strategic Operations Officer, & Chief Engineer

Alpha 2:
Commanding Officer & Executive Officer