Aladdin’s Market-Leading HASP Software Licensing Authentication Token
Offers Full Support for Universal Applications

– Aladdin HASP named leader in Software Licensing Authentication Token
market for third straight year

CHICAGO, April, 2006 – Aladdin Knowledge Systems (Nasdaq:ALDN), the leader
in Software DRM, identity management and content security solutions, today
announced that its Aladdin HASP hardware-based software protection and
licensing solutions now offer support for Universal Applications. The HASP
HL and HASP4 software protection keys now support OS X.4 (Tiger) on both
Intel/Mac and PowerPC. The new support follows a recent IDC report that
named Aladdin as the #1 worldwide provider of Software Licensing
Authentication Tokens (SLAT) for the third straight year.

Software developers using HASP can now allow their customers to enjoy the
improved performance of the Intel-based Mac machines, while still allowing
their software to run on existing PowerPC-based Mac machines. For added
convenience, C API with an Xcode sample and a Daemon GUI-based installer
are also provided.

Expanded Support Illustrates Aladdin’s SLAT Leadership Position

HASP’s overall reliability and continued innovation and support for the
latest operating systems reinforce its ever-expanding market leadership.
Published in December 2005, IDC’s “Worldwide Hardware Authentication Token
2005-2009 Forecast and 2004 Vendor Shares” report places Aladdin’s HASL HL
ahead of all other providers, noting $50.4 million in revenue for 2004 and
37.2 percent of the market. The report also highlights Aladdin’s 20.9
percent increase in HASP HL sales from 2003 to 2004 — more than double the
percentage growth of the next largest competitor for the same period. An
abstract of the IDC report (Doc # 34452) is available online at www.idc.com.

“We’re pleased to announce this new Universal Applications support from
HASP,” said Avi Barir, vice president of Software Digital Rights Management
(DRM) at Aladdin Knowledge Systems. “This new support allows developers to
offer software that supports the latest performance-oriented operating
systems available, while consistently providing the same level of
convenience to customers using other platforms. Demonstrating our expanded
market leadership since 2002, the IDC report also underscores Aladdin’s
long-term commitment to provide unmatched security, reliability and
ease-of-use for software developers in need of powerful piracy protection
and licensing enforcement. We continue to gain market share because we
listen to our customers and offer the most reliable, most robust solution
available.”

About Aladdin HASP

The Aladdin HASP family provides a suite of revolutionary hardware- and
software-based anti-piracy solutions engineered for software publishers to
ensure that their intellectual property is protected and they get paid for
each product they ship. Aladdin HASP provides the highest level of
anti-piracy protection available to combat unauthorized copying and use.
HASP also delivers powerful new tools to enable innovative software
licensing schemes and flexible pricing models that allow publishers to
bring their products to market with confidence while increasing sales and
profits:

* HASP for Single-User: A hardware-based (HASP HL) or software-based (HASP
SL) solution for protecting and licensing software running on stand-alone
computers.

* HASP for Enterprise: A hardware-based (HASP HL Net) solution for
protecting and licensing software used by multiple users in network
environments and the enterprise.

* HASP for Trialware: A software-based solution (HASP TT) for creating
secure, controlled software trialware.

* HASP for Documents: A hardware-based system (HASP DocSeal) for protecting
intellectual property and sensitive information in HTML files.

HASP is the worldwide market leader in software DRM solutions and is used
by more software developers than any other product. In a recent
head-to-head comparison conducted by independent testing lab KeyLabs, HASP
finished far ahead of its closest competitor with a large lead in key
categories including security, ease-of-use, flexibility of tools and
functionality, and compatibility across platforms and environments.

About Aladdin

Aladdin Knowledge Systems Ltd. is a global provider of security solutions
that reduce software theft, authenticate network users and protect against
unwanted Internet and e-mail content, including spam, viruses and spyware.
Its security products are organized into two segments: Software Digital
Rights Management (DRM) and Enterprise Security. Aladdin’s Software DRM
products allow software publishers to protect their intellectual property
and increase revenues by reducing losses from software theft and piracy.
Its Enterprise Security solutions enable organizations to secure their
information technology assets by controlling who has access to their
networks (authentication) and what content their users can utilize (content
security). Visit the Aladdin Web site at www.Aladdin.com..