HERZOG, FOX & NEEMAN ASIA HOUSE, 4 WEIZMANN ST.
64 239 TEL-AVIV, ISRAEL
TEL: (972-3)-692-2020
FAX: (972-3)-696-6464
EMAIL: hfn@hfn.co.il

MICHAEL FOX YAAKOV NEEMAN TUVIA ERLICH MEIR LINZEN ALAN SACKS YAACOV BRANDT EHUD SOL JANET LEVY PAHIMA ELDAR BEN-RUBY AMIR SERAYA YAEL (NEEMAN) BAR-SHAI EDITH ROTH YAACOV SHARVIT ALON SAHAR ELIOT SACKS BARUCH KATZMAN DAVID ZAILER NEIL WILKOF MARK PHILLIPS ADAM EYTAN ORLY GERBI MOSHE HARDI GILAD WEKSELMAN YOSSI ASHKENAZI GIL WHITE ANTHONY LEIBLER ELDAD CHAMAM RAN TAL EFRAT RAM ILANIT LANDESMAN YOGEV LIMOR HODIR ORY NACHT IFAT GINSBURG MAYA RACINE NETSER BOAZ TAL SHLOMIT SPINDEL KAREN L. ELBURG LIAT SHAKED-KATZ RUTH DAGAN GAL ROZENT MAYA ALCHEH-KAPLAN DOTAN BARUCH HANAN HAVIV ASHER DOVEV RONI LIBSTER NURIT DAGAN ARNON MAINFELD RONEN BAHARAV ROYI NACHIMZON RONI TIROSH MADERER MICHAL KAMIR HANNAH MORDECHAI AMNON EPSTEIN MENACHEM NEEMAN ODELIA OFFER SHARON PETEL MORIA TAM-HARSHOSHANIM ALON GURFINKEL YANIV DINOVITCH NIR RABER JAMES FRANKS RUTH BERGWERK OFIR SHAER SHIRA MARGALIT -ELBAZ RINAT HARUSH YIGAL PEE'R BOAZ MIZRAHI NATALI AMIR TAMAR KALENBERG TAL DROR OFIR SEGEV JAN S. WIMPFHEIMER ROBERT WISEMAN MORAN YEMINI SAAR PAUKER GUY KATZ SHAI KAGAN ROTEM SHAY ANAT PAZ RAN HAI ARNON TURM EFRI BERKOVICH ORIT HIPSHER SHACHAR PORAT AMIR PERES ELAD SHAUL GUY HAYIK AMIR COZACOV KAREN GILMOUR DALIA LITAY SHIBOLETH RONI DULBERG TOMER AMITAI OMRI EREZ MILI NEEMAN AVI RAZ OFER GRANOT MOSHE YAACOV URI KATZMAN GAL SCHWARTZ DANA VOLANOVSKY TAL PALDI OFRA GORDON ERAN WAGNER NIGEL KRAVITZ MATTHEW FISHER LOUIS GLASS ORIT STRAUSS NATHAN STEINBERG YIFAT TAVOR MARC DAUGHERTY LIOR AHARON SHIMON ATIYA MORAN BARNEA

29 June 2006

File No: 20671

Aladdin Knowledge Systems Ltd.

15 Beit Oved Street

Tel Aviv 61110

Israel

Ladies and Gentlemen:

We have acted as special Israeli counsel to Aladdin Knowledge Systems Ltd., an Israeli company (the “Company”), in connection with the Registration Statement on Form F-8 (the “Registration Statement”), filed by the Company with the Securities and Exchange Commission on the date hereof. The Registration Statement relates to the registration under the Securities Act of 1933, as amended, of 500,000 ordinary shares of the Company, par value NIS 0.01 per share (“Ordinary Shares”), authorized for issuance under the Aladdin Knowledge Systems Ltd. 2003 Worldwide Share Option Plan (the “Plan”).

In so acting, we have examined such statutes, regulations, corporate records, documents and other instruments, and such certificates or comparable documents of public officials and of officers and representatives of the Company, and have made such inquiries of such officers and representatives, as we have deemed relevant and necessary as a basis for the opinion hereinafter set forth.

In such examination, we have assumed the genuineness of all signatures, the legal capacity of natural persons, the authenticity of all documents submitted to us as originals, the conformity to

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original documents of all documents submitted to us as certified, conformed or photostatic copies and the authenticity of the originals of such latter documents. As to all questions of fact material to this opinion that have not been independently established, we have relied upon certificates or comparable documents of officers and representatives of the Company. We have considered such questions of Israeli law as we have deemed necessary for the purpose of rendering this opinion. We are members of the Bar of the State of Israel and, in rendering our opinion, we do not pass (expressly or by implication) on the laws of any jurisdiction other than the State of Israel. Our opinion relates only to Israeli laws.

Based upon the foregoing, we are of the opinion that the Ordinary Shares have been duly authorized and, when issued and paid for in the manner contemplated by the Plan, will be validly issued, fully paid and nonassesable.

We hereby consent to the filing of this opinion as an exhibit to the Registration Statement.

Very truly yours,
 
/s/ Herzog, Fox & Neeman