Document:

PROXY

         THIS PROXY (this "Proxy"), dated as of June 19, 2007, is made and
entered into by and among Kronos Advanced Technologies, Inc., a Nevada
corporation ("Company"), and each of the undersigned holders of securities of
the Company who are signatories hereto (each, a "Security Holder").

         WHEREAS, contemporaneously with the execution of this Agreement, the
Company and each Security Holder have entered into a Voting Agreement of even
date herewith (the "Voting Agreement") pursuant to which each Security Holder
has agreed to vote (i) in favor of a slate of directors of the Company's board
of directors as proposed by AirWorks Funding LLLP ("AirWorks"), subject to the
composition of such slate's compliance with all applicable laws and regulations,
(ii) in favor of adjusting the size of the Company's board of directors such
that upon the election of the slate of directors proposed by AirWorks, such
directors hold a majority of the seats on the Company's board of directors,
(iii) in favor of approving an amendment to the Company's articles of
incorporation to increase the Company's authorized common stock to a number of
shares necessary to allow the Lenders (as below defined) to convert the entire
amount of the Financing (as below defined) into shares of common stock of the
Company as provided in the Funding Agreement (as below defined), (iv) in favor
of reincorporating the Company in Delaware, subject to the Company's board of
director's recommendation of such action (v) in favor of a reverse stock split
proposed by AirWorks or the Company's board of directors and (vi) against any
action or transaction that may reasonably be expected to impede, interfere with,
delay, postpone or attempt to discourage the consummation of any of the
foregoing., or refrain from taking, certain actions to allow the Company to
obtain secured convertible debt financing from AirWorks and other individuals
and entities (AirWorks and such other individuals and entities are collectively
referred to herein as, the "Lenders") in an amount up to $18,159,000 (the
"Financing") pursuant to the terms of that certain Funding Agreement of even
date herewith (the "Funding Agreement");

         WHEREAS, each Security Holder owns securities of the Company and
desires to enter into this Proxy pursuant to which he, she or it agrees, among
other things, that Richard E. Perlman may vote all of the Subject Shares (as
defined in the Voting Agreement) held by such Security Holder in favor of the
actions contemplated by the Voting Agreement; and

         WHEREAS, the Lenders would not provide the Financing in the absence of
this Proxy, and the Security Holders hereby acknowledge that each of them will
derive a benefit as a result of the Financing.

         NOW, THEREFORE, in consideration of the foregoing and of the promises,
representations, warranties and agreements contained herein, and intending to be
legally bound hereby, the parties agree as follows:

<PAGE>

1. Proxy. By executing this Proxy, each Security Holder hereby irrevocably
appoints Richard E. Perlman, the attorney, agent and proxy for the undersigned
and in the name, place and stead of the undersigned, in respect of any of the
matters set forth in clauses (i) through (vi) of the first "Whereas" clause
above set forth, to vote or, if applicable, to give written consent, with
respect to all the Subject Shares owned by such Security Holder which such
Security Holder is or may be entitled to vote at any meeting of the Company held
after the date hereof, whether annual or special and whether or not an adjourned
meeting, or, if applicable, to give written consent with respect thereto. This
proxy is coupled with an interest, shall be irrevocable and binding on any
successor in interest of each Security Holder and shall not be terminated by
operation of law upon the occurrence of any event, including the death or
incapacity of any Security Holder. The proxy granted hereby and set forth herein
shall operate to revoke any prior proxy as to the Subject Shares heretofore
granted by any Security Holder. This proxy shall terminate on the Expiration
Date (as defined in the Voting Agreement). This proxy has been executed in
accordance with Section 78.355 of the Nevada Revised Statutes.

2. General Provisions.

(a) Amendments. This Proxy may not be amended except by an instrument in writing
signed by each of the parties hereto.

(b) Notice. All notices, requests, claims, demands and other communications
hereunder shall be in writing and shall be deemed given if delivered personally
or sent by overnight courier (providing proof of delivery) to each party hereto
at his, her or its address set forth below such party's name on the signature
page hereto (or at such address for a party as shall be specified by like
notice).

(c) Interpretation. When a reference is made in this Proxy to a Section, such
reference shall be to a Section of this Proxy unless otherwise indicated. The
headings contained in this Proxy are for reference purposes only and shall not
affect in any way the meaning or interpretation of this Proxy. Wherever the
words "include, or "including" are used in this Proxy, they shall be deemed to
be followed by the words "without limitation."

(d) Counterparts. This Proxy may be executed in one or more counterparts, all of
which shall be considered one and the same agreement, and shall become effective
when one or more of the counterparts have been signed by each of the parties and
delivered to the other party.

(e) Entire Agreement; No Third Party Beneficiaries. This Proxy (i) constitutes
the entire agreement and supersedes all prior agreements and understandings,
both written and oral, among the parties with respect to the subject matter
hereof and (ii) is not intended to confer upon any person other than the parties
hereto any rights or remedies hereunder.

(f) Governing Law. This Proxy shall be governed by, and construed in accordance
with the laws of the State of New York, regardless of the laws that might
otherwise govern under applicable principles of conflicts of law thereof.

3. Enforcement. The parties agree that irreparable damage would occur in the
event that any of the provisions of this Proxy (including the provisions of
Section 2) were not performed in accordance with their specific terms or were
otherwise breached. It is accordingly agreed that the parties shall be entitled
to specific performance and injunctive relief to prevent any threatened breach
of this Agreement.

<PAGE>

4. Severability. In the event that any provisions of this Proxy or the
application thereof becomes or is declared by a court of competent jurisdiction
to be illegal, void or unenforceable, the remainder of this Proxy shall continue
in full force and effect and the application of such provision to other persons
or circumstances will be interpreted so as to effect the intent of the parties
hereto. The parties further agree to replace such void or unenforceable
provision of this Proxy with a valid and enforceable provision that will
achieve, to the fullest extent possible, the original intent of the parties.

5. Fiduciary Duties. Each Security Holder is signing this Proxy solely in such
Security Holder's capacity as an owner of his, her or its respective securities
of the Company and/or Subject Shares, and nothing in this Proxy shall prohibit,
prevent or preclude such Security Holder from taking or not taking any action in
his, her or its capacity as an officer of director of the Company, to the extent
any such action is not in conflict with provisions hereof.

                                 ***************

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed as of the date first written above.

                                      COMPANY:

                                      Kronos Advanced Technologies, Inc.

                                      By:    /s/ Richard F. Tusing
                                             -----------------------------
                                      Name:  Richard F. Tusing

                                      Title:    COO
                                      Address:  464 Common Street, Suite 301
                                                Belmont, MA 02478

<TABLE>
<CAPTION>

                                            STOCKHOLDERS:
<S>     <C>
Security Holder                                             Subject Shares
---------------                                             --------------
                                                                                        Options to Purchase Shares
                                                            Shares of Stock Held        of Stock Held by Security
                                                            by Security Holder          Holder

/s/ Daniel R. Dwight                                               1,201,926                       7,191,206
-------------------------------------------
Daniel R. Dwight
Address:     464 Common Street, Suite 301
             Belmont, MA 02478

/s/ James McDermott                                                  294,118                         638,459
-------------------------------------------
James McDermott
Address:     464 Common Street, Suite 301
             Belmont, MA 02478

/s/ Milton Segal                                                           -                         573,500
-------------------------------------------
Milton Segal
Address:     464 Common Street, Suite 301
             Belmont, MA 02478

/s/ Richard Tusing                                                   852,752                       3,391,756
-------------------------------------------
Richard Tusing
Address:     464 Common Street, Suite 301
             Belmont, MA 02478

/s/ Igor Krichtafovitch                                            1,053,000                       4,955,726
-------------------------------------------
Igor Krichtafovitch
Address:     15241 NE 90th Street
             Redmond, WA 98052

/s/ Richard A. Sun                                                 4,587,400                               -
-------------------------------------------
Richard A. Sun
Address:     10182 Castlewood Lane
             Oakton, VA 22124

/s/ Richard A. Sun                                                   601,500                               -
-------------------------------------------
Richard A. Sun, as attorney-in-fact for
Fredric R. Gumbinner
Address:     11200 Sorrel Ridge Lane
             Oakton, VA 22124
</TABLE>Notice of Stock Option Grant and Stock Option Agreement with David L. Schneider

 Exhibit 10.21 
 DATA DOMAIN, INC. 2002 STOCK PLAN 
 NOTICE OF STOCK OPTION GRANT (WITH ACCELERATION) 
 You have been granted the following option to purchase shares of the Common Stock of Data Domain, Inc. (the “Company”): 
  

			
	Name of Optionee:	  	David Schneider
		
	Total Number of Shares:	  	13,774
		
	Type of Option:	  	Incentive Stock Option (ISO)
		
	Exercise Price Per Share:	  	$7.26
		
	Date of Grant:	  	February 12, 2007
		
	Date Exercisable:	  	This option may be exercised at any time after the Date of Grant for all or any part of the Shares subject to this option.
		
	Vesting Commencement Date:	  	February 12, 2007
		
	Vesting Schedule:	  	The Right of Repurchase shall lapse with respect to 1/48th
of the Shares subject to this option when the Optionee completes each month of continuous Service after the Vesting Commencement Date. The Right of Repurchase may lapse on an accelerated basis under Section 7(b) of the Stock Option
Agreement.
		
	Expiration Date:	  	February 11, 2017. This option expires earlier if the Optionee’s Service terminates earlier, as provided in Section 6 of the Stock Option Agreement.

 By your signature and the signature of the Company’s representative below, you and the Company agree that
this option is granted under and governed by the terms and conditions of the 2002 Stock Plan and the Stock Option Agreement, both of which are attached to and made a part of this document. 
 You were granted an option to purchase 200,000 Shares in the aggregate on the Date of Grant set forth above. The option was split into this ISO and an NSO to purchase
186,226 Shares. You agree and acknowledge that with respect to the Date of Grant set forth above, you have not received or are entitled to receive any other Stock or options or any other rights to purchase Stock on such date. To the extent that you
have received documentation evidencing Stock or options or any other rights to purchase Stock with the Date of Grant set forth above, such documentation is hereby superseded in its entirety. 
  

							
	OPTIONEE:	 		 	DATA DOMAIN, INC.
				
	  
	 		 	By:	 	  

				
		 		 	Title:	 	  

 DATA DOMAIN, INC. 2002 STOCK
PLAN 
 NOTICE OF STOCK OPTION GRANT
(WITH ACCELERATION) 
 You have been granted the following option to purchase shares of the Common Stock of
Data Domain, Inc. (the “Company”): 
  

			
	Name of Optionee:	  	David Schneider
		
	Total Number of Shares:	  	186,226
		
	Type of Option:	  	Nonstatutory Stock Option (NSO)
		
	Exercise Price Per Share:	  	$7.26
		
	Date of Grant:	  	February 12, 2007
		
	Date Exercisable:	  	This option may be exercised at any time after the Date of Grant for all or any part of the Shares subject to this option.
		
	Vesting Commencement Date:	  	February 12, 2007
		
	Vesting Schedule:	  	The Right of Repurchase shall lapse with respect to 1/48th
of the Shares subject to this option when the Optionee completes each month of continuous Service after the Vesting Commencement Date. The Right of Repurchase may lapse on an accelerated basis under Section 7(b) of the Stock Option
Agreement.
		
	Expiration Date:	  	February 11, 2017. This option expires earlier if the Optionee’s Service terminates earlier, as provided in Section 6 of the Stock Option Agreement.

 By your signature and the signature of the Company’s representative below, you and the Company agree that
this option is granted under and governed by the terms and conditions of the 2002 Stock Plan and the Stock Option Agreement, both of which are attached to and made a part of this document. 
 You were granted an option to purchase 200,000 Shares in the aggregate on the Date of Grant set forth above. The option was split into this NSO and an ISO to purchase
13,774 Shares. You agree and acknowledge that with respect to the Date of Grant set forth above, you have not received or are entitled to receive any other Stock or options or any other rights to purchase Stock on such date. To the extent that you
have received documentation evidencing Stock or options or any other rights to purchase Stock with the Date of Grant set forth above, such documentation is hereby superseded in its entirety. 
  

							
	OPTIONEE:	 		 	DATA DOMAIN, INC.
				
	  
	 		 	By:	 	  

				
		 		 	Title:	 	  

 THE OPTION GRANTED PURSUANT TO THIS AGREEMENT AND THE SHARES ISSUABLE UPON THE EXERCISE THEREOF HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE COMPANY AND ITS COUNSEL, THAT SUCH
REGISTRATION IS NOT REQUIRED. 
 DATA DOMAIN, INC. 2002 STOCK
PLAN: 
 STOCK OPTION AGREEMENT (WITH
ACCELERATION) 
 SECTION 1. GRANT OF OPTION. 
 (a) Option. On the terms and conditions set forth in the Notice of Stock Option Grant and this Agreement, the Company grants to the Optionee on the Date of Grant the option to purchase at the Exercise Price the
number of Shares set forth in the Notice of Stock Option Grant. The Exercise Price is agreed to be at least 100% of the Fair Market Value per Share on the Date of Grant (110% of Fair Market Value if Section 3(b) of the Plan applies). This
option is intended to be an ISO or an NSO, as provided in the Notice of Stock Option Grant. 
 (b) $100,000 Limitation. Even if this
option is designated as an ISO in the Notice of Stock Option Grant, it shall be deemed to be an NSO to the extent (and only to the extent) required by the $100,000 annual limitation under Section 422(d) of the Code. 
 (c) Stock Plan and Defined Terms. This option is granted pursuant to the Plan, a copy of which the Optionee acknowledges having received. The
provisions of the Plan are incorporated into this Agreement by this reference. Capitalized terms are defined in Section 14 of this Agreement. 
 SECTION 2. RIGHT TO EXERCISE. 
 (a) Exercisability. Subject to Subsection (b) below and the other conditions set
forth in this Agreement, all or part of this option may be exercised prior to its expiration at the time or times set forth in the Notice of Stock Option Grant. Shares purchased by exercising this option may be subject to the Right of Repurchase
under Section 7. 
 (b) Stockholder Approval. Any other provision of this Agreement notwithstanding, no portion of this option
shall be exercisable at any time prior to the approval of the Plan by the Company’s stockholders. 
 SECTION 3. NO TRANSFER OR ASSIGNMENT OF OPTION.

 Except as otherwise provided in this Agreement, this option and the rights and privileges conferred hereby shall not be sold, pledged
or otherwise transferred (whether by operation of law or otherwise) and shall not be subject to sale under execution, attachment, levy or similar process. 

 SECTION 4. EXERCISE PROCEDURES. 
 (a) Notice of Exercise. The Optionee or the Optionee’s representative may exercise this option by giving written notice to the Company pursuant to Section 13(c). The notice shall specify the election
to exercise this option, the number of Shares for which it is being exercised and the form of payment. The person exercising this option shall sign the notice. In the event that this option is being exercised by the representative of the Optionee,
the notice shall be accompanied by proof (satisfactory to the Company) of the representative’s right to exercise this option. The Optionee or the Optionee’s representative shall deliver to the Company, at the time of giving the notice,
payment in a form permissible under Section 5 for the full amount of the Purchase Price. 
 (b) Issuance of Shares. After
receiving a proper notice of exercise, the Company shall cause to be issued one or more certificates evidencing the Shares for which this option has been exercised. Such Shares shall be registered (i) in the name of the person exercising this
option, (ii) in the names of such person and his or her spouse as community property or as joint tenants with the right of survivorship or (iii) with the Company’s consent, in the name of a revocable trust. In the case of Restricted
Shares, the Company shall cause such certificates to be deposited in escrow under Section 7(c). In the case of other Shares, the Company shall cause such certificates to be delivered to or upon the order of the person exercising this option.

 (c) Withholding Taxes. In the event that the Company determines that it is required to withhold any tax as a result of the exercise
of this option, the Optionee, as a condition to the exercise of this option, shall make arrangements satisfactory to the Company to enable it to satisfy all withholding requirements. The Optionee shall also make arrangements satisfactory to the
Company to enable it to satisfy any withholding requirements that may arise in connection with the vesting or disposition of Shares purchased by exercising this option. 
 SECTION 5. PAYMENT FOR STOCK. 
 (a) Cash. All or part of the Purchase Price may be paid in cash
or cash equivalents. 
 (b) Surrender of Stock. All or any part of the Purchase Price may be paid by surrendering, or attesting to the
ownership of, Shares that are already owned by the Optionee. Such Shares shall be surrendered to the Company in good form for transfer and shall be valued at their Fair Market Value on the date when this option is exercised. The Optionee shall not
surrender, or attest to the ownership of, Shares in payment of the Purchase Price if such action would cause the Company to recognize compensation expense (or additional compensation expense) with respect to this option for financial reporting
purposes. 
 (c) Exercise/Sale. If Stock is publicly traded, all or part of the Purchase Price and any withholding taxes may be paid
by the delivery (on a form prescribed by the Company) of an irrevocable direction to a securities broker approved by the Company to sell Shares and to deliver all or part of the sales proceeds to the Company. 
  

 2 

 (d) Exercise/Pledge. If Stock is publicly traded, all or part of the Purchase Price and any
withholding taxes may be paid by the delivery (on a form prescribed by the Company) of an irrevocable direction to pledge Shares to a securities broker or lender approved by the Company, as security for a loan, and to deliver all or part of the loan
proceeds to the Company. 
 SECTION 6. TERM AND EXPIRATION. 
 (a) Basic Term. This option shall in any event expire on the expiration date set forth in the Notice of Stock Option Grant, which date is 10 years after the Date of Grant (five years after the Date of Grant if
this option is designated as an ISO in the Notice of Stock Option Grant and Section 3(b) of the Plan applies). 
 (b) Termination of
Service (Except by Death). If the Optionee’s Service terminates for any reason other than death, then this option shall expire on the earliest of the following occasions: 
 (i) The expiration date determined pursuant to Subsection (a) above; 
 (ii) The date three months after the termination of the Optionee’s Service for any reason other than Disability; or 
 (iii) The date six months after the termination of the Optionee’s Service by reason of Disability. 
 The Optionee may exercise all or part of this option at any time before its expiration under the preceding sentence, but only to the extent that this option is
exercisable for vested Shares on or before the date when the Optionee’s Service terminates. When the Optionee’s Service terminates, this option shall expire immediately with respect to the number of Shares for which this option is not yet
exercisable and with respect to any Restricted Shares. In the event that the Optionee dies after termination of Service but before the expiration of this option, all or part of this option may be exercised (prior to expiration) by the executors or
administrators of the Optionee’s estate or by any person who has acquired this option directly from the Optionee by beneficiary designation, bequest or inheritance, but only to the extent that this option was exercisable for vested Shares on or
before the date when the Optionee’s Service terminated. 
 (c) Death of the Optionee. If the Optionee dies while in Service, then
this option shall expire on the earlier of the following dates: 
 (i) The expiration date determined pursuant to
Subsection (a) above; or 
 (ii) The date 12 months after the Optionee’s death. 
  

 3 

 All or part of this option may be exercised at any time before its expiration under the preceding sentence by the
executors or administrators of the Optionee’s estate or by any person who has acquired this option directly from the Optionee by beneficiary designation, bequest or inheritance, but only to the extent that this option is exercisable for vested
Shares on or before the Optionee’s death. When the Optionee dies, this option shall expire immediately with respect to the number of Shares for which this option is not yet exercisable and with respect to any Restricted Shares. 
 (d) Leaves of Absence. For any purpose under this Agreement, Service shall be deemed to continue while the Optionee is on a bona fide leave
of absence, if such leave was approved by the Company in writing and if continued crediting of Service for such purpose is expressly required by the terms of such leave or by applicable law (as determined by the Company). 
 (e) Notice Concerning ISO Treatment. Even if this option is designated as an ISO in the Notice of Stock Option Grant, it ceases to qualify for
favorable tax treatment as an ISO to the extent that it is exercised: 
 (i) More than three months after the date when the
Optionee ceases to be an Employee for any reason other than death or permanent and total disability (as defined in Section 22(e)(3) of the Code); 
 (ii) More than 12 months after the date when the Optionee ceases to be an Employee by reason of permanent and total disability (as defined in Section 22(e)(3) of the Code); or 
 (iii) More than three months after the date when the Optionee has been on a leave of absence for 90 days, unless the Optionee’s
reemployment rights following such leave were guaranteed by statute or by contract. 
 SECTION 7. RIGHT OF REPURCHASE. 
 (a) Scope of Repurchase Right. Until they vest in accordance with the Notice of Stock Option Grant and Subsection (b) below, the Shares
acquired under this Agreement shall be Restricted Shares and shall be subject to the Company’s Right of Repurchase. The Company, however, may decline to exercise its Right of Repurchase or may exercise its Right of Repurchase only with respect
to a portion of the Restricted Shares. The Company may exercise its Right of Repurchase only during the Repurchase Period following the termination of the Optionee’s Service. The Right of Repurchase may be exercised automatically under
Subsection (d) below. If the Right of Repurchase is exercised, the Company shall pay the Optionee an amount equal to the Exercise Price for each of the Restricted Shares being repurchased. 
 (b) Lapse of Repurchase Right. The Right of Repurchase shall lapse with respect to the Restricted Shares in accordance with the vesting schedule
set forth in the Notice of Stock Option Grant. In addition, if the Company is subject to a Change in Control before the Optionee’s Service terminates and the Optionee is subject to an Involuntary Termination within 12 months after the Change in
Control, then the vested portion of the Restricted Shares shall be determined by adding an additional 12 months to the Optionee’s actual Service. 
  

 4 

 (c) Escrow. Upon issuance, the certificate(s) for Restricted Shares shall be deposited in escrow
with the Company to be held in accordance with the provisions of this Agreement. Any additional or exchanged securities or other property described in Subsection (f) below shall immediately be delivered to the Company to be held in escrow. All
ordinary cash dividends on Restricted Shares (or on other securities held in escrow) shall be paid directly to the Optionee and shall not be held in escrow. Restricted Shares, together with any other assets held in escrow under this Agreement, shall
be (i) surrendered to the Company for repurchase upon exercise of the Right of Repurchase or the Right of First Refusal or (ii) released to the Optionee upon his or her request to the extent that the Shares have ceased to be Restricted
Shares (but not more frequently than once every six months). In any event, all Shares that have ceased to be Restricted Shares, together with any other vested assets held in escrow under this Agreement, shall be released within 90 days after
the earlier of (i) the termination of the Optionee’s Service or (ii) the lapse of the Right of First Refusal. 
 (d)
Exercise of Repurchase Right. The Company shall be deemed to have exercised its Right of Repurchase automatically for all Restricted Shares as of the commencement of the Repurchase Period, unless the Company during the Repurchase Period
notifies the holder of the Restricted Shares pursuant to Section 13(c) that it will not exercise its Right of Repurchase for some or all of the Restricted Shares. During the Repurchase Period, the Company shall pay to the holder of the
Restricted Shares the purchase price determined under Subsection (a) above for the Restricted Shares being repurchased. Payment shall be made in cash or cash equivalents and/or by canceling indebtedness to the Company incurred by the Optionee
in the purchase of the Restricted Shares. The certificate(s) representing the Restricted Shares being repurchased shall be delivered to the Company properly endorsed for transfer. 
 (e) Termination of Rights as Stockholder. If the Right of Repurchase is exercised in accordance with this Section 7 and the Company makes
available the consideration for the Restricted Shares being repurchased, then the person from whom the Restricted Shares are repurchased shall no longer have any rights as a holder of the Restricted Shares (other than the right to receive payment of
such consideration). Such Restricted Shares shall be deemed to have been repurchased pursuant to this Section 7, whether or not the certificate(s) for such Restricted Shares have been delivered to the Company or the consideration for such
Restricted Shares has been accepted. 
 (f) Additional or Exchanged Securities and Property. In the event of a merger or consolidation
of the Company with or into another entity, any other corporate reorganization, a stock split, the declaration of a stock dividend, the declaration of an extraordinary dividend payable in a form other than stock, a spin-off, an adjustment in
conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding securities, any securities or other property (including cash or cash equivalents) that are by reason of such transaction exchanged for, or
distributed with respect to, any Restricted Shares shall immediately be subject to the Right of Repurchase. Appropriate adjustments to reflect the exchange or distribution of such securities or property shall be made to the number and/or class of
the Restricted Shares. Appropriate adjustments shall also be made to the price per share to be 

  

 5 

 
paid upon the exercise of the Right of Repurchase, provided that the aggregate purchase price payable for the Restricted Shares shall remain the same. In the
event of a merger or consolidation of the Company with or into another entity or any other corporate reorganization, the Right of Repurchase may be exercised by the Company’s successor. 
 (g) Transfer of Restricted Shares. The Optionee shall not transfer, assign, encumber or otherwise dispose of any Restricted Shares without the
Company’s written consent, except as provided in the following sentence. The Optionee may transfer Restricted Shares to one or more members of the Optionee’s Immediate Family or to a trust established by the Optionee for the benefit of the
Optionee and/or one or more members of the Optionee’s Immediate Family, provided in either case that the Transferee agrees in writing on a form prescribed by the Company to be bound by all provisions of this Agreement. If the Optionee transfers
any Restricted Shares, then this Agreement shall apply to the Transferee to the same extent as to the Optionee. 
 (h) Assignment of
Repurchase Right. The Board of Directors may freely assign the Company’s Right of Repurchase, in whole or in part. Any person who accepts an assignment of the Right of Repurchase from the Company shall assume all of the Company’s
rights and obligations under this Section 7. 
 SECTION 8. RIGHT OF FIRST REFUSAL. 
 (a) Right of First Refusal. In the event that the Optionee proposes to sell, pledge or otherwise transfer to a third party any Shares acquired
under this Agreement, or any interest in such Shares, the Company shall have the Right of First Refusal with respect to all (and not less than all) of such Shares. If the Optionee desires to transfer Shares acquired under this Agreement, the
Optionee shall give a written Transfer Notice to the Company describing fully the proposed transfer, including the number of Shares proposed to be transferred, the proposed transfer price, the name and address of the proposed Transferee and proof
satisfactory to the Company that the proposed sale or transfer will not violate any applicable federal or state securities laws. The Transfer Notice shall be signed both by the Optionee and by the proposed Transferee and must constitute a binding
commitment of both parties to the transfer of the Shares. The Company shall have the right to purchase all, and not less than all, of the Shares on the terms of the proposal described in the Transfer Notice (subject, however, to any change in such
terms permitted under Subsection (b) below) by delivery of a notice of exercise of the Right of First Refusal within 30 days after the date when the Transfer Notice was received by the Company. 
 (b) Transfer of Shares. If the Company fails to exercise its Right of First Refusal within 30 days after the date when it received the
Transfer Notice, the Optionee may, not later than 90 days following receipt of the Transfer Notice by the Company, conclude a transfer of the Shares subject to the Transfer Notice on the terms and conditions described in the Transfer Notice,
provided that any such sale is made in compliance with applicable federal and state securities laws and not in violation of any other contractual restrictions to which the Optionee is bound. Any proposed transfer on terms and conditions different
from those described in the Transfer Notice, as well as any subsequent proposed transfer by the Optionee, shall again be subject to the Right of First Refusal and shall require compliance with the procedure described in 

  

 6 

 
Subsection (a) above. If the Company exercises its Right of First Refusal, the parties shall consummate the sale of the Shares on the terms set forth in
the Transfer Notice within 60 days after the date when the Company received the Transfer Notice (or within such longer period as may have been specified in the Transfer Notice); provided, however, that in the event the Transfer Notice provided
that payment for the Shares was to be made in a form other than cash or cash equivalents paid at the time of transfer, the Company shall have the option of paying for the Shares with cash or cash equivalents equal to the present value of the
consideration described in the Transfer Notice. 
 (c) Additional or Exchanged Securities and Property. In the event of a merger or
consolidation of the Company with or into another entity, any other corporate reorganization, a stock split, the declaration of a stock dividend, the declaration of an extraordinary dividend payable in a form other than stock, a spin-off, an
adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding securities, any securities or other property (including cash or cash equivalents) that are by reason of such transaction exchanged
for, or distributed with respect to, any Shares subject to this Section 8 shall immediately be subject to the Right of First Refusal. Appropriate adjustments to reflect the exchange or distribution of such securities or property shall be made
to the number and/or class of the Shares subject to this Section 8. 
 (d) Termination of Right of First Refusal. Any other
provision of this Section 8 notwithstanding, in the event that the Stock is readily tradable on an established securities market when the Optionee desires to transfer Shares, the Company shall have no Right of First Refusal, and the Optionee
shall have no obligation to comply with the procedures prescribed by Subsections (a) and (b) above. 
 (e) Permitted
Transfers. This Section 8 shall not apply to (i) a transfer by beneficiary designation, will or intestate succession or (ii) a transfer to one or more members of the Optionee’s Immediate Family or to a trust established by
the Optionee for the benefit of the Optionee and/or one or more members of the Optionee’s Immediate Family, provided in either case that the Transferee agrees in writing on a form prescribed by the Company to be bound by all provisions of this
Agreement. If the Optionee transfers any Shares acquired under this Agreement, either under this Subsection (e) or after the Company has failed to exercise the Right of First Refusal, then this Agreement shall apply to the Transferee to the
same extent as to the Optionee. 
 (f) Termination of Rights as Stockholder. If the Company makes available, at the time and place and
in the amount and form provided in this Agreement, the consideration for the Shares to be purchased in accordance with this Section 8, then after such time the person from whom such Shares are to be purchased shall no longer have any rights as
a holder of such Shares (other than the right to receive payment of such consideration in accordance with this Agreement). Such Shares shall be deemed to have been purchased in accordance with the applicable provisions hereof, whether or not the
certificate(s) therefor have been delivered as required by this Agreement. 
 (g) Assignment of Right of First Refusal. The Board of
Directors may freely assign the Company’s Right of First Refusal, in whole or in part. Any person who accepts an assignment of the Right of First Refusal from the Company shall assume all of the Company’s rights and obligations under this
Section 8. 
  

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 SECTION 9. LEGALITY OF INITIAL ISSUANCE. 
 No Shares shall be issued upon the exercise of this option unless and until the Company has determined that: 
 (a) It and the Optionee have taken any actions required to register the Shares under the Securities Act or to perfect an exemption from
the registration requirements thereof; 
 (b) Any applicable listing requirement of any stock exchange or other securities
market on which Stock is listed has been satisfied; and 
 (c) Any other applicable provision of federal, state or foreign law
has been satisfied. 
 SECTION 10. NO REGISTRATION RIGHTS. 
 The Company may, but shall not be obligated to, register or qualify the sale of Shares under the Securities Act or any other applicable law. The Company shall not be obligated to take any affirmative action in order
to cause the sale of Shares under this Agreement to comply with any law. 
 SECTION 11. RESTRICTIONS ON TRANSFER. 
 (a) Securities Law Restrictions. Regardless of whether the offering and sale of Shares under the Plan have been registered under the Securities Act
or have been registered or qualified under the securities laws of any state, the Company at its discretion may impose restrictions upon the sale, pledge or other transfer of such Shares (including the placement of appropriate legends on stock
certificates or the imposition of stop-transfer instructions) if, in the judgment of the Company, such restrictions are necessary or desirable in order to achieve compliance with the Securities Act, the securities laws of any state or any other law.

 (b) Market Stand-Off. In connection with any underwritten public offering by the Company of its equity securities pursuant to an
effective registration statement filed under the Securities Act, including the Company’s initial public offering, the Optionee or a Transferee shall not directly or indirectly sell, make any short sale of, loan, hypothecate, pledge, offer,
grant or sell any option or other contract for the purchase of, purchase any option or other contract for the sale of, or otherwise dispose of or transfer, or agree to engage in any of the foregoing transactions with respect to, any Shares acquired
under this Agreement without the prior written consent of the Company or its underwriters. Such restriction (the “Market Stand-Off”) shall be in effect for such period of time following the date of the final prospectus for the offering as
may be requested by the Company or such underwriters. In no event, however, shall such period exceed 180 days. The Market Stand-Off shall in any event terminate two years after the date of the Company’s initial public offering. In the event of
the declaration of a stock dividend, a spin-off, a stock split, an adjustment in conversion ratio, a recapitalization or a similar 

  

 8 

 
transaction affecting the Company’s outstanding securities without receipt of consideration, any new, substituted or additional securities which are by
reason of such transaction distributed with respect to any Shares subject to the Market Stand-Off, or into which such Shares thereby become convertible, shall immediately be subject to the Market Stand-Off. In order to enforce the Market Stand-Off,
the Company may impose stop-transfer instructions with respect to the Shares acquired under this Agreement until the end of the applicable stand-off period. The Company’s underwriters shall be beneficiaries of the agreement set forth in this
Subsection (b). This Subsection (b) shall not apply to Shares registered in the public offering under the Securities Act, and the Optionee or a Transferee shall be subject to this Subsection (b) only if the directors and officers of
the Company are subject to similar arrangements. 
 (c) Investment Intent at Grant. The Optionee represents and agrees that the Shares
to be acquired upon exercising this option will be acquired for investment, and not with a view to the sale or distribution thereof. 
 (d)
Investment Intent at Exercise. In the event that the sale of Shares under the Plan is not registered under the Securities Act but an exemption is available which requires an investment representation or other representation, the Optionee
shall represent and agree at the time of exercise that the Shares being acquired upon exercising this option are being acquired for investment, and not with a view to the sale or distribution thereof, and shall make such other representations as are
deemed necessary or appropriate by the Company and its counsel. 
 (e) Legends. All certificates evidencing Shares purchased under
this Agreement shall bear the following legend: 
 “THE SHARES REPRESENTED HEREBY MAY NOT BE SOLD, ASSIGNED, TRANSFERRED, ENCUMBERED OR
IN ANY MANNER DISPOSED OF, EXCEPT IN COMPLIANCE WITH THE TERMS OF A WRITTEN AGREEMENT BETWEEN THE COMPANY AND THE REGISTERED HOLDER OF THE SHARES (OR THE PREDECESSOR IN INTEREST TO THE SHARES). SUCH AGREEMENT GRANTS TO THE COMPANY CERTAIN RIGHTS OF
FIRST REFUSAL UPON AN ATTEMPTED TRANSFER OF THE SHARES AND CERTAIN REPURCHASE RIGHTS UPON TERMINATION OF SERVICE WITH THE COMPANY. THE SECRETARY OF THE COMPANY WILL UPON WRITTEN REQUEST FURNISH A COPY OF SUCH AGREEMENT TO THE HOLDER HEREOF WITHOUT
CHARGE.” 
 All certificates evidencing Shares purchased under this Agreement in an unregistered transaction shall bear the following legend (and such
other restrictive legends as are required or deemed advisable under the provisions of any applicable law): 
 “THE SHARES REPRESENTED
HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE COMPANY AND
ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED.” 
  

 9 

 (f) Removal of Legends. If, in the opinion of the Company and its counsel, any legend placed on a
stock certificate representing Shares sold under this Agreement is no longer required, the holder of such certificate shall be entitled to exchange such certificate for a certificate representing the same number of Shares but without such legend.

 (g) Administration. Any determination by the Company and its counsel in connection with any of the matters set forth in this
Section 11 shall be conclusive and binding on the Optionee and all other persons. 
 SECTION 12. ADJUSTMENT OF SHARES. 
 In the event of any transaction described in Section 8(a) of the Plan, the terms of this option (including, without limitation, the number and kind
of Shares subject to this option and the Exercise Price) shall be adjusted as set forth in Section 8(a) of the Plan. In the event that the Company is a party to a merger or consolidation, this option shall be subject to the agreement of merger
or consolidation, as provided in Section 8(b) of the Plan. 
 SECTION 13. MISCELLANEOUS PROVISIONS. 
 (a) Rights as a Stockholder. Neither the Optionee nor the Optionee’s representative shall have any rights as a stockholder with respect to any
Shares subject to this option until the Optionee or the Optionee’s representative becomes entitled to receive such Shares by filing a notice of exercise and paying the Purchase Price pursuant to Sections 4 and 5. 
 (b) No Retention Rights. Nothing in this option or in the Plan shall confer upon the Optionee any right to continue in Service for any period of
specific duration or interfere with or otherwise restrict in any way the rights of the Company (or any Parent or Subsidiary employing or retaining the Optionee) or of the Optionee, which rights are hereby expressly reserved by each, to terminate his
or her Service at any time and for any reason, with or without cause. 
 (c) Notice. Any notice required by the terms of this
Agreement shall be given in writing. It shall be deemed effective upon (i) personal delivery, (ii) deposit with the United States Postal Service, by registered or certified mail, with postage and fees prepaid or (iii) deposit with
Federal Express Corporation, with shipping charges prepaid. Notice shall be addressed to the Company at its principal executive office and to the Optionee at the address that he or she most recently provided to the Company in accordance with this
Subsection (c). 
 (d) Entire Agreement. The Notice of Stock Option Grant, this Agreement and the Plan constitute the entire
contract between the parties hereto with regard to the subject matter hereof. They supersede any other agreements, representations or understandings (whether oral or written and whether express or implied) which relate to the subject matter hereof.

  

 10 

 (e) Choice of Law. This Agreement shall be governed by, and construed in accordance with, the laws
of the State of Delaware, as such laws are applied to contracts entered into and performed in such State. 
 SECTION 14. DEFINITIONS. 
 (a) “Agreement” shall mean this Stock Option Agreement. 
 (b) “Board of Directors” shall mean the Board of Directors of the Company, as constituted from time to time or, if a Committee has been appointed, such Committee. 
 (c) “Cause” shall mean: 
 (i) An unauthorized use or disclosure by the Optionee of the Company’s confidential information or trade secrets; 
 (ii) A material failure by the Optionee to comply with the Company’s written policies or rules; 
 (iii) The Optionee’s conviction of, or plea of “guilty” or “no contest” to, a felony under the laws of the United States or any state thereof; 
 (iv) The Optionee’s gross misconduct. 
 The foregoing, however, shall not be deemed an exclusive list of all acts or omissions that the Company (or a Parent or Subsidiary) may consider as grounds for the discharge of the Optionee without Cause. 
 (d) “Change in Control” shall mean: 
 (i) The consummation of a merger or consolidation of the Company with or into another entity or any other corporate reorganization, if persons who were not stockholders of the Company immediately prior to such merger,
consolidation or other reorganization own immediately after such merger, consolidation or other reorganization 50% or more of the voting power of the outstanding securities of each of (A) the continuing or surviving entity and (B) any
direct or indirect parent corporation of such continuing or surviving entity; or 
 (ii) The sale, transfer or other
disposition of all or substantially all of the Company’s assets. 
 A transaction shall not constitute a Change in Control if its sole purpose is to
change the state of the Company’s incorporation or to create a holding company that will be owned in substantially the same proportions by the persons who held the Company’s securities immediately before such transaction. 
 (e) “Code” shall mean the Internal Revenue Code of 1986, as amended. 
  

 11 

 (f) “Committee” shall mean a committee of the Board of Directors, as described in
Section 2 of the Plan. 
 (g) “Company” shall mean Data Domain, Inc., a Delaware corporation. 
 (h) “Consultant” shall mean a person who performs bona fide services for the Company, a Parent or a Subsidiary as a consultant or
advisor, excluding Employees and Outside Directors. 
 (i) “Date of Grant” shall mean the date specified in the Notice of
Stock Option Grant, which date shall be the later of (i) the date on which the Board of Directors resolved to grant this option or (ii) the first day of the Optionee’s Service. 
 (j) “Disability” shall mean that the Optionee is unable to engage in any substantial gainful activity by reason of any medically
determinable physical or mental impairment. 
 (k) “Employee” shall mean any individual who is a common-law employee of the
Company, a Parent or a Subsidiary. 
 (l) “Exercise Price” shall mean the amount for which one Share may be purchased upon
exercise of this option, as specified in the Notice of Stock Option Grant. 
 (m) “Fair Market Value” shall mean the fair
market value of a Share, as determined by the Board of Directors in good faith. Such determination shall be conclusive and binding on all persons. 
 (n) “Immediate Family” shall mean any child, stepchild, grandchild, parent, stepparent, grandparent, spouse, sibling, mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law or sister-in-law and shall
include adoptive relationships. 
 (o) “Involuntary Termination” shall mean the termination of the Optionee’s Service
by reason of: 
 (i) The involuntary discharge of the Optionee by the Company (or the Parent or Subsidiary employing him or
her) for reasons other than Cause; or 
 (ii) The voluntary resignation of the Optionee following (A) a change in the
Optionee’s position with the Company (or the Parent or Subsidiary employing him or her) that materially reduces his or her level of authority or responsibility, (B) a reduction in the Optionee’s base salary by more than 10% or
(C) receipt of notice that the Optionee’s principal workplace will be relocated more than 35 miles. 
 (p) “ISO”
shall mean an employee incentive stock option described in Section 422(b) of the Code. 
  

 12 

 (q) “Notice of Stock Option Grant” shall mean the document so entitled to which this
Agreement is attached. 
 (r) “NSO” shall mean a stock option not described in Sections 422(b) or 423(b) of the Code.

 (s) “Optionee” shall mean the person named in the Notice of Stock Option Grant. 
 (t) “Outside Director” shall mean a member of the Board of Directors who is not an Employee. 
 (u) “Parent” shall mean any corporation (other than the Company) in an unbroken chain of corporations ending with the Company, if each
of the corporations other than the Company owns stock possessing 50% or more of the total combined voting power of all classes of stock in one of the other corporations in such chain. 
 (v) “Plan” shall mean the Data Domain, Inc. 2002 Stock Plan, as in effect on the Date of Grant. 
 (w) “Purchase Price” shall mean the Exercise Price multiplied by the number of Shares with respect to which this option is being
exercised. 
 (x) “Repurchase Period” shall mean a period of 90 consecutive days commencing on the date when the
Optionee’s Service terminates for any reason, including (without limitation) death or disability. 
 (y) “Restricted
Share” shall mean a Share that is subject to the Right of Repurchase. 
 (z) “Right of First Refusal” shall mean
the Company’s right of first refusal described in Section 8. 
 (aa) “Right of Repurchase” shall mean the
Company’s right of repurchase described in Section 7. 
 (bb) “Securities Act” shall mean the Securities Act of
1933, as amended. 
 (cc) “Service” shall mean service as an Employee, Outside Director or Consultant. 
 (dd) “Share” shall mean one share of Stock, as adjusted in accordance with Section 8 of the Plan (if applicable). 
 (ee) “Stock” shall mean the Common Stock of the Company, with a par value of $0.0001 per Share. 
  

 13 

 (ff) “Subsidiary” shall mean any corporation (other than the Company) in an unbroken
chain of corporations beginning with the Company, if each of the corporations other than the last corporation in the unbroken chain owns stock possessing 50% or more of the total combined voting power of all classes of stock in one of the other
corporations in such chain. 
 (gg) “Transferee” shall mean any person to whom the Optionee has directly or indirectly
transferred any Share acquired under this Agreement. 
 (hh) “Transfer Notice” shall mean the notice of a proposed transfer
of Shares described in Section 8. 
  

 14

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