EXHIBIT 4.2

LOGO





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ST. BERNARD SOFTWARE, INC.

The Corporation will furnish without charge to each stockholder who so requests the powers, designations, preferences and relative, participating,
optional or other special rights of each class of stock or series thereof of the Corporation and the qualifications, limitations, or restrictions of such preferences and/or rights. This certificate and the shares represented thereby are issued and
shall be held subject to all the provisions of the Certificate of Incorporation and all amendments thereto and resolutions of the Board of Directors providing for the issue of shares of Preferred Stock (copies of which may be obtained from the
secretary of the Corporation), to all of which the holder of this certificate by acceptance hereof assents.

The following abbreviations,
when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations:



TEN COM



as tenants in common



UNIF GIFT MIN ACT



CustodianTEN ENT



as tenants by the entireties





(Cust)



(Minor)JT TEN



as joint tenants with right





under Uniform Gifts to Minors Actof survivorship and not astenants in common





(state)UNIF TRF MIN ACT



Custodian

(until age  )(Cust)under Uniform Transfers(Minor)to Minors Act(State)


Additional abbreviations may also be used though not in the above list.



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For Value Received,
 hereby sell, assign and transfer unto



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|PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE

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|(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)



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| |  | Shares

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|of the capital stock represented by the within Certificate, and do hereby irrevocably constitute and appoint |  |         
|                                                                                                             |  | Attorney

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|to transfer the said stock on the books of the within-named Corporation with full power of substitution in the premises. |  | 



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|      |  |  |  |  |  |  |  | NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT
ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.



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|Signature(s) Guaranteed: |  |                                                                                                                                                                                                                                                   |  | 
|                         |  | THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED
SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C. 17Ad-15. |  |