Document:

<PAGE>

                                  Exhibit 10.25

                             2003 EVP INCENTIVE PLAN

Name:                      Chris Schoettle
Title:                     EVP Technology, Networks and Support

Base salary:               $300,000
Annual incentive target:   $100,000

Your annual bonus is based on the Company's performance against stated financial
objectives and operational objectives. You must be an employee for the entire
year to be eligible to receive the annual incentive payment, which will be paid
in the quarter following the end of the performance period.

At the discretion of the CEO and/or Compensation Committee of the Board,
performance criteria are subject to revision based on changes in circumstances
including new business direction or extraordinary events.

Incentives below or above target will be determined based on interpolation.
Performance at target will receive funding at target. Performance below
threshold levels will receive no funding. Funding for performance below or above
target will be interpolated using a "straight line" approach. Performance above
"maximum" of plan may be capped at the sole discretion of the CEO and the
Compensation Committee of the Board.

PERFORMANCE CRITERIA

<TABLE>
<CAPTION>
CRITERIA                              WEIGHT     THRESHOLD      MIN     TARGET      MAX
--------                              ------     ---------      ---     ------      ---
<S>                                   <C>        <C>          <C>       <C>        <C>
TOTAL RECOGNIZED REVENUE ($000,000)     20%       <$134       $  134    $135.7     $  150
BONUS PAYOUT ($000)                                $  0       $ 10.0    $ 20.0     $ 40.0

NETWORK COGS AS A % OF REVENUE          40%       <  21%          21%       20%        19%
BONUS PAYOUT ($000)                                $  0       $ 20.0    $ 40.0     $ 80.0

FCF+, Q4 2003 ($000,000)                10%       <$0.0       $  0.0    $  1.0     $  5.0
BONUS PAYOUT ($000)                                $  0       $  5.0    $ 10.0     $ 20.0

EDGE COMPUTING (DEALS CLOSED IN 2003)   30%       <  15           15        25         35

BONUS PAYOUT ($000)                                $  0       $15.00    $ 30.0     $ 60.0

TOTAL                                  100%        $0.0       $ 50.0    $100.0     $200.0
</TABLE>

Bonuses are conditional on your compliance with the Code of Business Ethics as
in effect from time to time during 2003.
<PAGE>
DEFINITION

RECOGNIZED REVENUE

Recognized revenue means Total Revenue as reported in the Company's consolidated
financial statements filed with the Securities and Exchange Commission on Form
10-K or Form 10-Q ("Public Company Financial Statements"). If, at any time, the
Company is not required to make periodic reports under the Exchange Act,
"Revenue" shall mean Total Revenue as set forth on regularly prepared quarterly
financial statements prepared by management ("Private Company Financial
Statements").

NETWORK COGS

Network Costs of Goods Sold (COGS) will include bandwidth costs, co-location
costs, software licenses, NCS consulting, Net IQ, and other costs as determined
by Finance and set forth on regularly prepared quarterly financial statements
prepared by management for internal use.

FREE CASH FLOW POSITIVE

Unless otherwise determined by the Board of Directors, "positive Free Cash Flow"
shall have been achieved when the sum of the Company's (A) Cash and Cash
Equivalents, (B) Short-Term Marketable Securities and (C) Long-Term Marketable
Securities ("Free Cash") as of the end of a fiscal quarter, as reported in the
Company's Public Company Financial Statements or Private Company Financial
Statements for such quarter, as applicable at such time, is greater than the
Company's Free Cash at the end of the preceding quarter.

EDGECOMPUTING

For the purposes of this goal, an EdgeComputing customer is any customer paying
Akamai to deploy, execute, process and deliver at least one application on
Akamai's network. An EdgeComputing solution will generally involve executing
Java code on our network, and/or processing other forms of code, like ESI or
XSLT. The key differentiation from any other service or product is that
EdgeComputing is the service we sell to Akamaize an "application," not whole
sites or objects or streams (e.g., EdgeSuite and Streaming). An application
represents a tangible business function (e.g. verbs like locate dealer, vote,
choose wallpaper, register, broker, regulate entrance (waiting room)). For
example, Tickets.com would be an EdgeComputing deal (application: waiting room,
solution: ESI logic, not caching), while MTV is an EdgeSuite customer today
(WebSite, Solution: ESI for caching not logic). Every EdgeComputing contract
will also incorporate either EdgeSuite Delivery or EdgeSuite Enterprise Edition
to manage bandwidth and other features specifically associated with enabling the
identified application.

Acceptance        /s/ Chris Schoettle                  May 2, 2003
                --------------------------         ---------------------
                  Chris Schoettle                    Date

Approved by:      /s/ George Conrades                  May 2, 2003
                --------------------------         ---------------------
                  George Conrades                    Date<PAGE>
                                                                    EXHIBIT 10.1

                        FOREIGN EXCHANGE MASTER AGREEMENT

This Foreign Exchange Master Agreement (this "Agreement") is made this 31st day
of March, 2003 by and among CITIZENS BANK OF MASSACHUSETTS (the "Bank") with an
address of 28 State Street, Boston, MA 02109, Lightbridge, Inc. a Delaware
corporation, and its wholly owned subsidiaries, Corsair Communications, Inc. a
Delaware corporation, Coral Systems, Inc. a Delaware corporation and Lightbridge
Security Corporation a Massachusetts corporation, (jointly and severally
referred to herein as the "Customer").

WHEREAS, the Customer on a joint and several basis desires from time to time to
enter into transactions for the purchase of one currency in exchange for the
sale of another currency (each such transaction, an "FX Transaction") and the
Bank may agree to enter into FX Transactions at the direction of the Customer,
subject to the terms and conditions set forth herein.

NOW THEREFORE, in consideration of the mutual covenants herein contained, and
other good and valuable consideration, receipt and sufficiency of which are
hereby acknowledged, the parties agree as follows:

I.       INTERPRETATION

         1.       FOREIGN EXCHANGE AGREEMENT

                  Although neither the Customer nor the Bank shall have any
                  obligation to enter into FX Transactions, this Agreement sets
                  forth the general terms and conditions that will apply to each
                  FX Transaction entered into by and between the Customer and
                  the Bank. This Agreement, the terms agreed between the
                  Customer and the Bank with respect to each FX Transaction as
                  evidenced by a Confirmation (as hereinafter defined), and all
                  amendments to any of such items shall together form the
                  complete and exclusive agreement between the Customer and the
                  Bank. In the event of any inconsistency between this Agreement
                  and any Confirmation, the provisions of the Confirmation shall
                  prevail to extent necessary to resolve the conflict. In the
                  event this Agreement conflicts with any other agreement
                  between the Bank and the Customer, including without
                  limitation, the agreement and disclosures governing any
                  Account, the terms of this Agreement shall prevail to the
                  extent necessary to resolve such conflict. The Customer and
                  the Bank acknowledge that all FX Transactions are entered into
                  in reliance upon such fact, it being understood that the
                  Customer and the Bank would not otherwise enter into any FX
                  Transaction.

         2.       DEFINITIONS

                  "ACCOUNT" means the deposit account or accounts the Customer
                  maintains with the Bank for business or commercial purposes
                  and which the Customer has designated in the Authorization
                  Certificate as an account that is subject to this Agreement.

                  "APPLICABLE LAW" shall mean the laws of the United States
                  (including without limitation the USA Patriot Act and the
                  regulations promulgated thereunder), any applicable state laws
                  and regulations, including without limitation, the Uniform
                  Commercial Code as adopted by the state whose laws govern this
                  Agreement, the operating circulars of the Federal Reserve
                  System, the National Automated Clearing House Association
                  rules and any other rules of any money transfer systems used
                  by the Bank and any of the depository institutions necessary
                  to settle Payment Orders, each as in effect from time to time.

                                       1
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                  "AUTHORIZATION CERTIFICATE" means a certificate, substantially
                  in the form attached hereto as Schedule II (2).

                  "AUTHORIZED REPRESENTATIVE" means any of the Customer's
                  officers or employees that the Customer designates in an
                  Authorization Certificate as being the Customer's authorized
                  representative, or as authorized in writing to act on the
                  Customer behalf, with respect to an Order or any other actions
                  taken in accordance with the terms of this Agreement.

                  "BUSINESS DAY" means any day on which the Bank is open to
                  conduct substantially all of its business.

                  "CREDIT SUPPORT" means any Security Interest, deposit account,
                  guarantee, indemnity, surety, letter of comfort or other
                  arrangement required by the Bank in connection with this
                  Agreement.

                  "ELECTRONIC TRANSMISSION" means a message transmitted by
                  facsimile, telecopy, telex (whether or not tested), telegram,
                  radio, teletype, SWIFT, or any other form of non-paper media
                  transmitted by electronic or mechanical method of transmission
                  including e-mail and other internet transmissions through the
                  Web Site (but not telephone).

                  "EXCHANGE DATE" means any Business Day that is also a day on
                  which commercial banks effect delivery of the foreign currency
                  that is being bought or sold by the Customer pursuant to an
                  Order.

                  "FEDERAL FUNDS RATE" shall mean for the period involved, the
                  average of the interest rates for each day of the period set
                  forth in H 15(519) opposite the caption "Federal Funds
                  (Effective)." H 15(519) means the weekly statistical release
                  designated as such, or any such successor publication
                  published by the Board of Governors of the Federal Reserve
                  System.

                  "INDEBTEDNESS" means all sums now owing or that may in the
                  future be owing by the Customer to the Bank, whether direct or
                  indirect, whether on demand, at stated maturity, by
                  acceleration or otherwise, and whether for principal,
                  interest, purchase price, margin or additional payments, fees,
                  expenses, costs of replacement transactions, indemnification
                  or otherwise arising under or pursuant to any agreement with
                  the Bank, as all such agreements may be amended, restated or
                  replaced from time to time.

                  "INSOLVENCY EVENT" means the occurrence of any of the
                  following in respect of the Customer or the happening of any
                  similar or analogous event under the laws of any jurisdiction:

                  (a)      the Customer shall commence a voluntary case or other
                           proceeding seeking liquidation, reorganization or
                           other relief with respect to itself or to its debts
                           under any bankruptcy, insolvency or similar law, or
                           seeking the appointment of a trustee, receiver,
                           liquidator, conservator, administrator, judicial
                           manager, custodian or other similar official (each, a
                           "Custodian") of it or any substantial part of its
                           assets, or shall take any corporate action to
                           authorize any of the forgoing;

                  (b)      an involuntary case or other proceeding shall be
                           commenced against the Customer seeking liquidation,
                           reorganization or other relief with respect to itself
                           or to its debt under any bankruptcy, insolvency or
                           similar law or seeking the appointment of a Custodian
                           of it or any substantial part of its assets;

                  (c)      the Customer is bankrupt or insolvent; or

                                       2
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                  (d)      the Customer shall otherwise be unable to pay its
                           debts as they become due.

                  "ORDER" means the Customer's instructions, which may be
                  transmitted by telephone or any other manner permitted by the
                  Bank from time to time, to purchase or sell a designated
                  number of units of a foreign currency at a specific price in
                  United States dollars or any other mutually agreed upon
                  currency.

                  "SECURITY INTEREST" means, without limitation, any and all
                  types of collateral security, present or future, whether in
                  the form of a lien, charge, encumbrance, mortgage, deed of
                  trust, bill of sale (as defined in any statute), pledge,
                  hypothecation, title retention arrangement, trust or power, as
                  or in effect as security for the payment of a monetary
                  obligation or the observance of any other obligation.

                  "SETTLEMENT DATE" means the Exchange Date specified in an
                  Order.

                  "TRANSACTION DOCUMENTS" means this Agreement (including all
                  Confirmations), any Credit Support, any letter from the Bank
                  to the Customer offering financial accommodation or foreign
                  exchange facilities which is accepted in writing by the
                  Customer, any instrument which is acknowledged to be a
                  Transaction Document and any other document connected with the
                  foregoing documents.

                  "WEB SITE" shall mean that internet site made available by the
                  Bank or any affiliate of the Bank to provide internet and
                  online services to its customers and to the Customer.

         3.       JOINT AND SEVERAL LIABILITY.

                  It is the intention of the parties to this Agreement that all
                  obligations of "Customer" or "Customers" created hereunder and
                  pursuant to all other Transaction Documents shall be the joint
                  and several obligations of Lightbridge, Inc., Corsair
                  Communications, Inc., Coral Systems, Inc., and Lightbridge
                  Security Corporation. All references to "Customer" shall be
                  interpreted to refer to any one of Lightbridge, Inc., Corsair
                  Communications, Inc., Coral Systems, Inc., or Lightbridge
                  Security Corporation alone, acting singly or in their sole
                  capacity or any two or more of them acting jointly or in
                  conjunction with any others. Unless the context of this
                  Agreement otherwise clearly requires, this Agreement shall be
                  interpreted in the light most favorable to this intention.

II.      INITIATING AN FX TRANSACTION

         1.       ORDER

                  The Customer may initiate an FX Transaction by placing an
                  Order with the Bank, which Order the Bank may accept or reject
                  in its sole discretion. The Bank shall be under no obligation
                  to purchase or sell a currency at the most favorable exchange
                  rate then available. An Order must include the type of foreign
                  currency and the number of units of such foreign currency that
                  the Customer desires to purchase or sell at a specific price
                  in United States dollars and the Exchange Date on which the
                  purchase or sale shall occur. Subject to each party's rights
                  to correct errors as provided in Section II (4) below, an
                  Order may not be cancelled or amended after it has been
                  accepted by the Bank and a Confirmation has been sent.

                                       3
<PAGE>
         2.       AUTHORIZED REPRESENTATIVES

                  (a)      The Customer agrees to give the Bank written notice
                           in an Authorization Certificate, or any other
                           document the Bank deems acceptable, of the names and
                           titles of the Customer's Authorized Representatives
                           and any dollar or other limits the Customer wants
                           placed on any Orders requested by the Customer or by
                           any such Authorized Representative. The Customer
                           agrees that the Bank may rely on the authority of an
                           Authorized Representative without independent
                           investigation or verification until the Customer has
                           provided the Bank with an amended Authorization
                           Certificate, or until the Bank has received written
                           notice to the contrary from the Customer, and the
                           Bank has had a reasonable opportunity to act upon any
                           such amended Authorization Certificate or notice. The
                           Bank shall be under no obligation to verify the
                           identity of any person who purports to be an
                           Authorized Representative.

                  (b)      The Bank may, in its sole discretion, refuse to
                           accept an Authorized Representative or any person
                           that an Authorized Representative designates to act
                           on his or her behalf, or execute an Order from an
                           Authorized Representative or any person an Authorized
                           Representative designates to act on his or her behalf
                           until the Customer has provided the Bank with any
                           information or documentation in a form that is
                           acceptable to the Bank, which the Bank reasonably
                           considers necessary or appropriate in connection with
                           this Agreement. The Customer acknowledges that the
                           Bank may require a reasonable time period before the
                           Bank acts on any designation by the Customer of an
                           Authorized Representative, including any limits the
                           Customer wants placed on an Authorized
                           Representative.

                  (c)      In the absence of any written notification to the
                           contrary, the Customer shall be able to rely upon any
                           employee of the Bank who works in the International
                           Department as having actual authority to agree to FX
                           Transactions on behalf of the Bank during normal
                           business hours (8:30 a.m. to 5:00 p.m. EST Monday to
                           Friday).

         3.       CONFIRMATION

                  If an Order is acceptable to the Bank, the Bank shall deliver
                  to the Customer a "Confirmation". A Confirmation shall be in
                  writing to the address specified by the Customer (including
                  telex, facsimile or other electronic means from which it is
                  possible to produce a hard copy) evidencing the Order and
                  itemizing the:

                  (a)      name and address of the Customer,

                  (b)      type of foreign currency and the number of units of
                           such foreign currency being bought or sold by the
                           Customer,

                  (c)      Settlement Date,

                  (d)      rate at which one currency will be exchanged into
                           another, and

                  (e)      any other term generally included in such a writing
                           in accordance with the practice of the relevant
                           foreign exchange market.

         4.       CONFIRMATION OF FX TRANSACTION OR NOTICE OF ERROR

                  The Customer must review each Confirmation and either:

                                       4
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                  (a)      confirm the FX Transaction, or

                  (b)      promptly notify the Bank of any errors.

                  Failure to confirm does not negate, or vary in any way, an FX
                  Transaction entered into by telephone. If either party claims
                  that a Confirmation is incorrect in any respect, it must
                  notify the other party no later than two Business Days after
                  receipt of such Confirmation or such shorter period of time as
                  appropriate given the Settlement Date of the FX Transaction.
                  If a party notifies the other party of an error within such
                  time period, both parties shall negotiate in good faith to the
                  correct the terms of the FX Transaction. If a party does not
                  notify the other party of an error within such period, such
                  party will be deemed to have accepted the terms of the FX
                  Transaction as set forth in the Confirmation. In addition, if
                  the Bank performs its obligations in connection with an FX
                  Transaction in accordance with the terms set forth in a
                  Confirmation that has not been properly disputed as provided
                  herein, the Customer shall be obligated to perform its
                  obligations in accordance with the terms of such Confirmation.

IIA.     COMMUNICATIONS WITH THE BANK

         1.       COMMUNICATIONS VIA THE INTERNET.

                  This Agreement contemplates that the Customer may choose to
                  electronically submit an Order to the Bank or receive and
                  review a Confirmation through the Web Site or by Electronic
                  Transmission, by accessing the Web Site or by sending or
                  receiving an Electronic Transmission through Customer's
                  computer equipment and web browser software. The Customer is
                  responsible for providing its own computer equipment and web
                  browser software and shall be responsible for all acquisition,
                  installation, repair and maintenance costs associated
                  therewith. The Customer shall select its own internet service
                  provider. The Customer shall comply promptly with all
                  instructions on the Web Site or as otherwise provided to the
                  Customer by the Bank governing its use and the security
                  measures to be maintained in connection with its use. The
                  Customer authorizes the Bank to receive data and act upon
                  Customer's Order and other requests that the Bank receives
                  over the Web Site. The Customer agrees that the Bank may rely
                  on the authenticity and accuracy of messages and information
                  received by the Bank on the Web Site purporting to be from the
                  Customer. The Customer agrees:

                  (a)      to protect all assigned operator identification
                           passwords and accepts full responsibility for any
                           compromise of the Customer's security;

                  (b)      to limit access to the Web Site to those persons
                           authorized by Customer through the use of security
                           procedures implemented and enforced by the Customer;

                  (c)      to accurately input any data fields necessary to
                           initiate, release (subject to the other provisions of
                           this Agreement ) or cancel any Orders or
                           Confirmations;

                  (d)      to access the Web Site as often as necessary
                           consistent with the business activities the Customer
                           conducts on the Web Site, which may be daily, and
                           retrieve and review outstanding Confirmations; and

                  (e)      to notify the Bank promptly of any error or defect in
                           such Confirmation.

                                       5
<PAGE>
                  The Customer acknowledges and understands that Orders,
                  Confirmations and other instructions sent by it through the
                  internet to the Bank and the information retrieved by the
                  Customer from the Web Site through the internet will be
                  encrypted, but that such encryption is not completely secure
                  and is not free from errors, poor transmissions, interception,
                  forgery, viruses, tampering, destruction, deciphering or other
                  delay or casualty. The Bank shall not be liable for any loss,
                  claim or liability, cost or expense arising from:

                  (a)      any of the foregoing;

                  (b)      failure of any internet service provider to provide
                           its services;

                  (c)      failure of communications media;

                  (d)      legal restrictions;

                  (e)      act of God, fire or other catastrophe, or any other
                           cause or circumstance beyond the Bank's control;

                  (f)      any unauthorized person's use of or access to the Web
                           Site;

                  (g)      computer hardware or software failure or
                           interruption, or

                  (h)      failure of the Customer to report errors or defects
                           promptly.

         2.       COMMUNICATIONS VIA ELECTRONIC SYSTEMS.

                  The Customer may desire to transmit and receive by means of
                  facsimile, open internet communication, or other unguarded
                  electronic communications (hereinafter collectively the
                  "Electronic Systems") Orders, confirmations of Confirmations
                  and other paper-writings to or from the Bank. To induce the
                  Bank to accept communication via Electronic Systems, the
                  Customer shall:

                  (a)      ensure that its officers, agents and employees, will
                           at all times follow and maintain the integrity of any
                           security established by the Customer and the Bank;

                  (b)      promptly notify the Bank in the event that the
                           Customer should have reason to believe the security
                           established for Electronic Systems has been breached
                           or compromised in any manner;

                  (c)      ensure that only authorized personnel selected and
                           controlled by the Customer request action(s) by
                           transmittal of document(s) by Electronic Systems;

                  (d)      ensure that any documents transmitted to the Bank by
                           means of Electronic Systems shall be a complete and
                           accurate copy and if signed be executed by personnel
                           authorized by the Customer; and

                  (e)      maintain its software and equipment and any privacy
                           control device within such software or equipment
                           without any reliance on or responsibility by the
                           Bank. The Customer acknowledges and agrees that the
                           Bank:

                           (i)      shall not be responsible to the Customer for
                                    any loss or damage arising from the use of
                                    Electronic Systems, including access or
                                    misuse of the Customer's

                                       8
<PAGE>
                                    confidential information, transmission of a
                                    virus, or failed, incomplete or inaccurate
                                    transmission;

                           (ii)     shall not be responsible to assure that, its
                                    software and equipment for receiving
                                    messages or documents from Electronic
                                    Systems will be compatible with that of the
                                    Customer or available at all times for the
                                    Customer's use, but shall make reasonable
                                    efforts to notify the customer if the Bank
                                    becomes aware of such incompatibility or
                                    availability;

                           (iii)    has absolute discretion but without
                                    liability, for any reason whatsoever, not to
                                    act upon documentation received by
                                    Electronic Systems; provided, however, that
                                    the Bank shall notify the Customer promptly
                                    should it elect to defer action until the
                                    original documentation is physically
                                    presented to the Bank;

                           (iv)     has, without any liability on its part to do
                                    so, the right at its discretion to make
                                    further inquiries and demand further
                                    verification to determine the validity of
                                    any document prior to taking any action; and

                           (v)      has the right to assume that any
                                    reproduction of the original documentation
                                    and all signatures are authorized and
                                    genuine.

         3.       INDEMNITY.

                  Separate and independent from any other indemnity set forth in
                  this Agreement, the Customer hereby indemnifies and holds the
                  Bank harmless against any and all loss, liability, damage or
                  expense of whatever kind and nature arising from Bank's
                  acceptance and/or delivery of information, Orders or
                  Confirmations over its Web Site or by Electronic Systems.

III.     SCOPE OF DUTY

         1.       FURTHER ASSURANCES

                  The Bank has no obligation to make any payment to the Customer
                  in connection with the Settlement of an FX Transaction it
                  previously accepted unless:

                  (a)      The Bank has received any Credit Support it may
                           require;

                  (b)      No Event of Default or any event which with the
                           giving of notice, lapse of time or fulfillment of any
                           condition would be likely to become an Event of
                           Default has occurred;

                  (c)      The Bank has received an Authorization Certificate
                           and all approvals, delivery instructions, opinions or
                           other documents that it has reasonably requested; and

                  (d)      The Bank believes that the making of any such payment
                           would not result in a violation of any Applicable Law
                           or reasonably subject the Bank to unacceptable risk
                           of loss.

         2.       NO OTHER OBLIGATIONS

                  The Bank shall only be obliged to act in accordance with this
                  Agreement and Orders properly given by the Customer to the
                  Bank as evidenced by a Confirmation. Unless otherwise agreed
                  to in writing, the Bank shall have no other obligations and,
                  in particular, the

                                       7
<PAGE>
                  Bank shall have no obligation to liquidate or to close any FX
                  Transaction or position on any Account the Bank may open for
                  the Customer.

IV.      SETTLEMENT OF AN FX TRANSACTION

         1.       GENERAL

                  Subject to the other provisions of this Agreement, each party
                  will pay or deliver any amount payable by it in respect of an
                  FX Transaction for value on the Settlement Date all as
                  specified in the Confirmation in freely transferable funds and
                  in the manner customary for payments in the required currency.

         2.       NETTING PAYMENTS IN THE SAME CURRENCY

                  Unless otherwise agreed in a Confirmation, if on any
                  Settlement Date more than one delivery of a particular
                  currency is to be made between the parties, each party shall
                  aggregate the amounts of such currency deliverable by it and
                  only the difference between these aggregate amounts shall be
                  deliverable by the party owing the larger aggregate amount to
                  the other party, and if the amounts are equal, no delivery of
                  the currency shall be made.

         3.       INTEREST ON OVERDUE AMOUNTS

                  The Customer agrees to pay interest, both before and after
                  judgment, on any amount payable by it from when it becomes due
                  for payment until the Bank has been paid in full. Interest is
                  payable in the same currency as the overdue amount at a rate
                  equal to the Federal Funds Rate plus 2% per annum. Interest
                  will be calculated on a daily basis compounding monthly and on
                  the basis of the actual number of days elapsed. The Customer's
                  obligation to pay the outstanding amount on the date it
                  becomes due for payment is not affected by this clause.

         4.       AUTHORIZATION TO DEBIT ACCOUNTS

                  The Customer hereby expressly authorizes the Bank to debit all
                  of its Accounts for the purpose of making payment on its
                  behalf in the settlement of any FX Transaction or otherwise
                  obtaining any amounts owed to the Bank hereunder.

         5.       SETTLEMENT BY WIRE TRANSFER

                  In all cases where the settlement of a FX Transaction results
                  in the issuance by the Customer of a "Payment Order" (as that
                  term in defined in Article 4A of the Uniform Commercial Code
                  ("Article 4A") as adopted by the state whose laws govern this
                  Agreement) to the Bank (i.e., an electronic transfer of the
                  foreign currency purchased or sold by the Customer), the
                  Customer agrees that:

                  (a)      The Payment Order and funds transfer shall be
                           governed by Article 4A, and unless otherwise defined,
                           terms employed in this section shall have the
                           meanings ascribed to them in Article 4A.

                  (b)      The Customer will provide the name of the
                           beneficiary, the name and identification number of
                           the beneficiary's bank, the beneficiary bank's
                           routing number or SWIFT code and the beneficiary's
                           account number.

                  (c)      The Customer will pay any and all applicable Bank
                           fees and charges in respect of the funds transfer and
                           the Bank may debit any of the Accounts for such
                           amounts.

                                       8
<PAGE>
                  (d)      The Bank has no obligation to accept and execute any
                           Payment Order if:

                           (i)      the Account from which the FX Transaction is
                                    to be settled does not contain sufficient
                                    available and collected funds and the
                                    amounts owed to the Bank to settle such FX
                                    Transaction have not otherwise been paid by
                                    the Customer,

                           (ii)     the Payment Order is not authorized or does
                                    not comply with applicable security
                                    procedures

                           (iii)    the Bank acting in good faith has reasonable
                                    cause for rejecting the Payment Order or

                           (iv)     the Bank believes such Payment Order would
                                    violate any Applicable Law or involve an
                                    unauthorized or fraudulent transfer.

                  (e)      The Bank has no responsibility for failure to execute
                           a Payment Order where such failure is a result of a
                           delay by another bank or a Force Majeure Event (as
                           hereinafter defined).

                  (f)      The Bank has no responsibility to give notice of
                           receipt of a funds transfer.

                  (g)      The use by the Customer of any security procedure the
                           Bank establishes from time to time indicates the
                           Customer's agreement to the use of such security
                           procedure and its commercial reasonableness. The
                           Customer further agrees that the Bank's current
                           security procedure of calling an Authorized
                           Representative on a recorded line is a commercially
                           reasonable method for verifying that the Payment
                           Order (or any cancellation or amendment thereof) was
                           made by the Customer. The Customer acknowledges that
                           any security procedure used by the Bank is not
                           intended, and that it is commercially reasonable that
                           a security procedure is not intended, to detect any
                           errors relating to or arising out of a Payment Order
                           (or any cancellation or amendment thereof).

                  (h)      In executing a Payment Order, payment may be made
                           solely on the basis of the account number even if
                           that number identifies a person different from the
                           named beneficiary.

                  (i)      In executing a Payment Order, payment may be made
                           solely on the basis of the identification number or
                           routing number of the beneficiary bank even if that
                           number identifies a bank other than the named
                           beneficiary bank.

                  (j)      The Customer bears the risk of any loss resulting
                           from payment to the wrong person due to a Customer
                           generated error in identification, account or routing
                           number.

                  (k)      A cancellation or amendment of a Payment Order will
                           only be effective if the Customer notifies the Bank
                           in a manner such that the Bank has a reasonable
                           opportunity to cancel or amend the Payment Order
                           before it executes the Payment Order.

                  (l)      The Customer will exercise ordinary care in detecting
                           unauthorized or erroneously executed Payment Orders
                           and will notify the Bank as soon as possible and in
                           any event within 14 days of such detection. The
                           Customer shall notify the Bank of the facts and
                           circumstances relating to any unauthorized Payment
                           Order or error

                                       9
<PAGE>
                           immediately after discovering any unauthorized
                           Payment Order or error. The Customer agrees to
                           provide the Bank with written notification of any
                           unauthorized Payment Order or error no later than
                           thirty (30) days after the Customer receives a
                           statement reflecting the Payment Order or error. If
                           the Customer fails to provide the Bank with such
                           notification within such time period and the Bank is
                           required under Applicable Law to refund all or part
                           of the funds attributable to the Payment Order, the
                           Bank will not pay any interest on the amount
                           refunded.

                  (m)      To the extent that the Bank is required to pay
                           interest on any amounts that are subject to an error
                           made by it, such interest rate shall be set at the
                           Federal Funds Rate for the period in question.

V.       REPRESENTATIONS AND WARRANTIES

         In order to induce the Bank to enter into this Agreement and to enter
         into FX Transactions, the Customer represents and warrants as of the
         date of this Agreement, and continuing so long as any FX Transactions
         remain outstanding, and so long as this Agreement remains in effect
         that:

         1.       EXISTENCE

                  The Customer is duly organized, validly existing and in good
                  standing under the laws of the jurisdiction in which it is
                  organized.

         2.       AUTHORITY

                  The Customer has adequate power and authority to perform all
                  of its obligations under this Agreement and in respect of all
                  FX Transactions.

         3.       DUE EXECUTION

                  The execution and delivery by the Customer of this Agreement
                  and all Confirmations and the performance of the Customer's
                  obligations hereunder and thereunder:

                  (a)      are within the Customer's powers;

                  (b)      are duly authorized;

                  (c)      are not in contravention of the terms of the
                           Customer's charter or bylaws, or of any indenture,
                           agreement or undertaking to which it is a party or by
                           which it or any of its property or assets are bound;

                  (d)      do not require any order, consent, approval or
                           authorization of, or registration or declaration
                           with, or the giving of any notice to, or the granting
                           of any exemption by, any person; and

                  (e)      do not contravene any law or contractual or
                           governmental restriction binding upon the Customer.

         4.       BINDING EFFECT

                  This Agreement is a legal, valid and binding obligation of the
                  Customer and will be enforceable against the Customer in
                  accordance with its terms.

                                       10
<PAGE>
VI.      COVENANTS

         The Customer covenants and agrees that so long as any FX Transactions
         remain outstanding, and so long as this Agreement remains in effect,
         unless otherwise consented to in writing by the Bank:

                  (a)      The Customer will at all times obtain and comply with
                           the terms of and do all that is necessary to maintain
                           in full force and effect all authorizations,
                           approvals, licenses and consents required to enable
                           it to lawfully perform its obligations under this
                           Agreement.

                  (b)      The Customer will promptly notify the Bank of the
                           occurrence of any Event of Default.

                  (c)      The Customer must not create or permit to exist any
                           Security Interest upon USD 3,000,000 of its present
                           or future property or assets held by the Bank as
                           described in Article VII below.

VII.     LIEN, SET-OFF AND COMBINATION

         USD 3,000,000 of the Customer's interest in any securities or any other
         property held by the Bank for any purpose (either individually or
         jointly with others) which may be in the Bank's possession at any time
         and for any purpose, including safekeeping, shall be subject to a
         general lien in the Bank's favor. The Bank is authorized to set-off,
         any sum due from the Customer to the Bank (whether or not under this
         Agreement) against up to USD 3,000,000 in monies owing by the Bank to
         the Customer, including money from time to time maintained by the
         Customer with the Bank (whether for safe custody or otherwise). The
         Bank is authorized to transfer and combine hereunder, in its reasonable
         discretion, all funds in the name of the Customer from one Account to
         another.

VIII.    NON-PERFORMANCE AND THE EFFECT OF NON PERFORMANCE

         1.       EVENTS OF DEFAULTS

                  Each of the following shall constitute an "Event of Default"
                  under this Agreement:

                  (a)      The Customer does not pay promptly when due and in
                           the manner required any money payable under any
                           Transaction Document.

                  (b)      The Customer does not observe any other obligations
                           under any Transaction Document and, if the
                           non-observance can be remedied, does not remedy the
                           non-observance within 5 Business Days of notice from
                           the Bank.

                  (c)      A material representation or warranty or statement
                           made, or deemed to be made or taken to be made to the
                           Bank in connection with a Transaction Document is
                           found to be incorrect or misleading when made or
                           deemed to be made.

                  (d)      A default in the payment when due (subject to any
                           applicable grace period), whether by acceleration or
                           otherwise, of any Indebtedness of the Customer.

                  (e)      An Insolvency Event occurs in respect of the
                           Customer.

                  (f)      The Customer fails to give adequate assurances of its
                           ability to perform any of its obligations hereunder
                           within two (2) Business Days of written request to do
                           so when

                                       11
<PAGE>
                           the Bank has reasonable grounds for insecurity,
                           including the determination by the Bank of any
                           material adverse change to the financial condition of
                           the Customer.

                  (g)      A Transaction Document is or becomes wholly or partly
                           void, voidable or unenforceable, or is claimed to be
                           so by the Customer or by anyone on its behalf.

         2.       EFFECT OF AN EVENT OF DEFAULT

                  If any Event of Default shall occur (and whether or not it is
                  continuing), the Bank shall have no further obligation to
                  enter into an FX Transaction, and may terminate this
                  Agreement. In addition, it shall have following rights:

                  (a)      At the reasonable determination of the Bank, the Bank
                           may at any time by notice to the Customer terminate
                           all outstanding FX Transactions.

                  (b)      The Bank's right of set-off described in Article VII
                           above shall be effective and enforceable immediately.

                  (c)      Upon termination, no further payments in respect of
                           outstanding FX Transactions will be required to be
                           made. Instead, the Bank shall determine the net
                           amount required to "close out" all outstanding FX
                           Transactions. If such "close out" amount is a
                           positive number, the Customer will immediately pay
                           such amount to the Bank; if such "close out" amount
                           is a negative number, the Bank will pay the absolute
                           value of such amount to the Customer.

                  For purposes of this Section, "close out" means the United
                  States dollar equivalent of the amount the Bank reasonably
                  determines in good faith to be required to settle in the
                  market all existing and outstanding obligations arising from
                  all existing and outstanding FX Transactions, and such amount
                  can include any loss of bargain, cost of funding or any loss
                  or cost incurred as a result of the Bank terminating,
                  liquidating, obtaining and/or reestablishing any hedge or
                  related trading position (or any gain resulting from any of
                  them).

         3.       MISCELLANEOUS

                  Included in any demand for payment of any "close out" amount,
                  the Bank will provide the Customer with a statement showing,
                  in reasonable detail, the manner in which the Bank calculated
                  the "close out" amount. For greater certainty, the Customer
                  hereby expressly agrees and acknowledges that in the event of
                  any failure by the Customer to pay any "close out" amount due
                  to the Bank within five Business Days of demand, the Bank's
                  right of set-off as described in Article VII above shall apply
                  to such amount. The Bank's rights under this Article are in
                  addition to, and not in limitation or exclusion of, any other
                  rights which the Bank may have (whether by agreement,
                  operation of law or otherwise).

IX.      MISCELLANEOUS

         1.       COMPLIANCE

                  The Customer and we each agree that all of FX Transactions
                  contemplated by this Agreement will be subject to, and will
                  comply with the Applicable Law, and the terms and conditions
                  of this Agreement.

                                       12
<PAGE>
         2.       ASSIGNMENT AND AMENDMENTS

                  All FX Transactions are for the benefit of the parties.
                  Neither party may act as trustee or agent for any other person
                  when entering an FX Transaction. No other person or entity
                  (including without limitation any customer of either party)
                  shall have any rights under any FX Transactions. The Customer
                  may not transfer, sell, assign, declare a trust of, or give a
                  Security Interest over all or part of their interest in any FX
                  Transaction or this Agreement without the written consent of
                  the Bank. No amendment or modification of this Agreement will
                  be effective unless executed in writing by each of the
                  parties. The Bank may assign its rights or delegate any of its
                  obligations hereunder without notice to or consent of the
                  Customer.

         3.       ACKNOWLEDGEMENT OF RISK

                  The Customer expressly confirms to the Bank that the Customer
                  has not relied on any representation or statement of the
                  Bank's as a basis for entering into this Agreement. The
                  Customer acknowledges the inherently speculative nature of any
                  advice, opinions or data relating to foreign currency values,
                  movements and trends and the Customer assumes the risks of
                  independently assessing such advice, opinions or data. The
                  Customer releases the Bank from any liability in relation to
                  any such advice, opinions or data which the Bank may give to
                  the Customer. The Bank further explicitly warns the Customer
                  that the risk of loss from FX Transactions can be substantial.
                  The Bank recommends that the Customer seek independent legal
                  and financial advice before opening a position with the Bank.
                  The Customer shall make all commercial decisions with respect
                  to all contracts entered into pursuant to this Agreement and
                  understands that any inexperience on the part of the Customer
                  with respect to trading in foreign exchange will increase the
                  likelihood of incurring a loss.

         4.       LIMITATION ON LIABILITY; INDEMNIFICATION.

                  (a)      The Customer acknowledges that except as expressly
                           prohibited by Applicable Law, the Bank, in performing
                           its duties in accordance with this Agreement, shall
                           only be liable to the Customer for its actual damages
                           and only to the extent that such damages are a direct
                           result of the Bank's gross negligence or willful
                           misconduct. The Bank shall not be responsible for
                           delays or failures in the performance of its
                           obligations hereunder caused by acts of God, war,
                           civil commotion, governmental action, fire, action by
                           third parties, equipment malfunction, power failure
                           or any other events or circumstances beyond its
                           reasonable control (each a "Force Majeure Event"). IN
                           NO EVENT SHALL EITHER PARTY BE LIABLE FOR ANY
                           CONSEQUENTIAL, SPECIAL, INDIRECT OR PUNITIVE DAMAGES
                           (INCLUDING LOSS OF PROFIT OR ATTORNEYS' FEES) IN
                           CONNECTION WITH THIS AGREEMENT, REGARDLESS OF WHETHER
                           SUCH CLAIMS ARISE IN CONTRACT OR TORT EVEN IF A PARTY
                           HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
                           WITH RESPECT TO PAYMENT ORDERS, THE BANK'S LIABILITY
                           SHALL BE FURTHER LIMITED AS PROVIDED IN ARTICLE IV
                           HEREOF.

                  (b)      Except for losses that result from the Bank's gross
                           negligence or willful misconduct, the Customer agrees
                           to indemnify and hold the Bank harmless from any and
                           all losses the Customer may incur or suffer arising
                           from an FX Transaction or from any losses suffered by
                           the Bank arising out of any action taken or omitted
                           to be taken in reliance upon:

                                       13
<PAGE>
                           (i)      any instruction or information provided to
                                    the Bank whether in accordance with this
                                    Agreement or not or

                           (ii)     any information contained in a Confirmation
                                    (other than any such information that has
                                    been corrected in the manner provided in
                                    Section II(4)).

         5.       DEALINGS BETWEEN THE PARTIES

                  The Customer agrees that the Bank accepts no responsibility
                  for any loss (consequential or otherwise) incurred as a result
                  of the Bank acting on instructions given by telephone, telex
                  or facsimile apparently given or sent by the Customer or its
                  Authorized Representatives. The Bank shall have no duty to
                  verify any notice sent by facsimile that appears to be proper
                  on its face. The Bank reserves the right to refuse any
                  instruction given by telephone, telex or facsimile. For
                  greater certainty, the Customer and the Bank further agree:

                  (a)      Telephone conversations between parties may be
                           recorded and used as evidence. The Bank may also
                           record any Payment Orders. The parties consent to
                           such recordings and agree that the recordings or
                           transcripts can be used as evidence in disputes,
                           including without limitation, evidence:

                           (i)      that an Order was placed or

                           (ii)     of the Customer's authorization to act on a
                                    Payment Order. Copies of recordings or
                                    transcripts made by one party will be
                                    supplied to the other upon request and upon
                                    payment of the cost of complying with the
                                    request. Neither party, however, is
                                    obligated to so record, retain or reproduce
                                    such items unless required to do so by
                                    Applicable Law.

         6.       NO AGENCY OR JOINT VENTURE

                  The Customer and the Bank are not partners, joint ventures or
                  agents of each other as a result of this Agreement.

         7.       NOTICES

                  Unless otherwise agreed, all notices, instructions and other
                  communications to be given to a party under this Agreement
                  shall be given to the address, telex, facsimile (confirmed if
                  requested) or telephone number and to the individual or
                  department set forth below or specified in a writing that
                  complies with the terms of this Section. The Customer hereby
                  expressly agrees that any notice addressed as set out below
                  shall be deemed to be notice given to all of them.

<TABLE>
<S>                                                <C>
                  To the Bank:                     Citizens Bank
                                                   International Banking
                                                   15th Floor
                                                   28 State Street
                                                   Boston, MA 02109

                  Telephone Number:                1-800-733-4630
                  Facsimile Number:                617-725-5887
                  Telex Number:                    211047 CTZINTLUR
                  Name of Salesperson:
</TABLE>

                                       14
<PAGE>
<TABLE>
<S>                                                         <C>
                  To the Customer:                          Lightbridge, Inc.
                                                            67 South Bedford Street, Burlington, MA 01803

                  Telephone Number:                         781-359-4000
                  Facsimile Number:                         781-359-4560
                  Telex Number:
                  Name of Individual or Department:         Bob Kilkenny
</TABLE>

         8.       GOVERNING LAW AND JURISDICTION, WAIVER OF JURY TRIAL

                  All FX Transactions entered into by the Bank and the Customer
                  shall be governed by and construed in accordance with the laws
                  of Massachusetts. Each party irrevocably waives any and all
                  right to trial by jury in any proceedings whether before a
                  court of law or otherwise.

         9.       TERMINATION

                  In addition to any rights to terminate this Agreement arising
                  as a result of the occurrence of an Event of Default, the Bank
                  reserves the right to terminate this Agreement at any time
                  upon 30 days' advance written notice to the Customer. The
                  Customer may terminate this agreement upon notice.

         10.      FURTHER ASSURANCES

                  The parties to this Agreement shall, upon the request of the
                  Bank, take any and all actions and execute any and all
                  documents reasonably necessary to effectuate the terms and
                  intent of this Agreement.

         11.      COUNTERPARTS

                  This Agreement may be executed in any number of counterparts,
                  which together shall constitute one instrument, and shall bind
                  and inure to the benefit of the parties hereto and their
                  respective permitted successors and assigns.

         12.      NO WAIVER

                  The Bank's failure, at any time or times hereafter, to require
                  strict performance by the Customer of any provision of this
                  Agreement shall not waive, affect or diminish any right of the
                  Bank thereafter to demand strict compliance and performance
                  therewith. Any suspension or waiver by the Bank of an Event of
                  Default by the Customer under this Agreement or a default
                  under any of the other Transaction Documents shall not
                  suspend, waive or affect any other Event of Default by the
                  Customer under this Agreement or any other default under any
                  of the other Transaction Documents, whether the same is prior
                  or subsequent thereto and whether of the same or of a
                  different kind or character. None of the undertakings,
                  agreements, warranties, covenants and representations of the
                  Customer contained in this Agreement or any of the other
                  Transaction Documents and no Event of Default by the Customer
                  under this Agreement or default under any of the other
                  Transaction Documents shall be deemed to have been suspended
                  or waived by the Bank unless such suspension or waiver is in
                  writing signed by an officer of the Bank, and directed to the
                  Customer specifying such suspension or waiver. The Bank shall
                  not be deemed to have waived any of its rights upon or under
                  this Agreement or any of the other Transaction Documents
                  unless such waiver is in writing and signed by the Bank. No
                  delay or omission on the part of the Bank in exercising any
                  other right shall operate as a waiver of such right or any
                  other right.

                                       15
<PAGE>
                  A waiver on any one occasion shall not be construed as a bar
                  to or waiver of the assertion of any right on any future
                  occasion.

         13.      SEVERABILITY

                  In the event any one or more of the provisions contained in
                  this Agreement should be held invalid, illegal or
                  unenforceable in any respect under the law of any
                  jurisdiction, the validity, legality and enforceability of the
                  remaining provisions contained in this Agreement, and the
                  validity, legality and enforceability of such and any other
                  provisions under the law of any other jurisdiction shall not
                  in any way be affected or impaired thereby. The parties shall
                  endeavor in good faith negotiations to replace the invalid,
                  illegal or unenforceable provisions with valid provisions the
                  economic effect of which comes as close as possible to that of
                  the invalid, illegal or unenforceable provisions.

         14.      HEADINGS

                  Headings in this Agreement are for ease of reference only.

         15.      SCHEDULES

                  Any authorization granted to any representative of the
                  Customer pursuant to any writing delivered to the Bank
                  hereunder, whether in the form of Schedule II (2) or by any
                  other means, shall remain in full force and effect until the
                  Bank receives express written notice that such authorization
                  has been revoked, and the Bank has had a reasonable period of
                  time to act in response to such notice.

                                       16
<PAGE>
                  IN WITNESS WHEREOF, the parties hereto have executed or caused
                  this Agreement to be executed by their respective officers
                  thereunto duly authorized, as of the day first written above
                  and it shall take effect as a sealed instrument.

<TABLE>
<S>                                                                    <C>
         LIGHTBRIDGE, INC.

         By:
              /s/ Harlan Plumley                                       /s/ Robert Kilkenny
              ------------------------------                           ----------------------
              Name:   Harlan Plumley                                         Witness
              Title:  CFO

         CORSAIR COMMUNICATIONS, INC.

         By:
              /s/ Harlan Plumley                                       /s/ Robert Kilkenny
              ------------------------------                           ----------------------
              Name:   Harlan Plumley                                         Witness
              Title:  Treasurer

         CORAL SYSTEMS, INC.

         By:
              /s/ Harlan Plumley                                       /s/ Robert Kilkenny
              ------------------------------                           ----------------------
              Name:   Harlan Plumley                                         Witness
              Title:  Treasurer

         LIGHTBRIDGE SECURITY CORPORATION

         By:
              /s/ Harlan Plumley                                       /s/ Robert Kilkenny
              ------------------------------                           ----------------------
              Name:   Harlan Plumley                                          Witness
              Title:  Treasurer

         CITIZENS BANK
         By:
              /s/ Marshall C. Sugarman
              ------------------------------
                  Name:   Marshall C. Sugarman
                  Title:  Vice President
</TABLE>

                                       17

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