Employment Offer Letter and Change in Control Agreement

As you are aware, Sonic Solutions (“Sonic”) and DivX, Inc. (“DivX”) are in the process of consummating a transaction pursuant to which DivX will be merged into a wholly-owned subsidiary of Sonic (the “Transaction”). We are pleased to extend an offer of continued employment to you to commence upon the closing of the Transaction (“Closing”).

Our offer (and your acceptance) is conditioned upon the Closing taking place. While we hope that Closing will occur, the Transaction is subject to a number of contingencies and approvals. You should understand that this letter does not impose any additional obligation on us to complete the Transaction. Nor should you interpret this letter as any representation on our part that the Transaction will close. For the avoidance of doubt, if the Transaction does not close, each of us acknowledge and agree that no aspect of this letter will be binding on either of us, and neither party will have waived or otherwise relinquished, or be deemed to have waived or otherwise relinquished, any rights. For convenience, the balance of this letter uses language as though Closing has occurred or will occur.

Upon the Closing, your employment with DivX shall terminate. On the first business day following the Closing, you will be employed by Sonic in the position of Executive Vice President, Business Development, reporting to me. For clarity, DivX shall make all payments to you that you are entitled to receive as a terminated employee of DivX upon the date of the Closing, including without limitation under the DivX Change in Control Severance Benefit Plan and the DivX bonus plan.

In your capacity as Executive Vice President, Business Development, we expect you to dedicate your full time and best efforts to the performance of your position. Subject to the provisions of this agreement, Sonic may change your position, duties and work location from time to time in its discretion. Your employment will be subject to other terms and conditions applicable to all Sonic employees as further described in our current Employee Handbook.

You will be based in the Bay Area in your San Francisco home office and in our Novato office. Your position may require that you travel from time to time. To facilitate your move to the Bay Area, you will receive a sign-on bonus of $25,000 payable on or before October 20, 2010.

In this position you will be a regular employee of Sonic. Your base salary will be $320,000 per annum. In addition, your cash bonus target will be $160,000 per annum. Your salary will be paid semi-monthly, less payroll deductions and all required withholdings. Paydays are on the 15^th and final day of each month (or the next business day).

Upon or as soon as practicable after the Closing, and subject to board approval, we will grant you an option to purchase 250,000 shares of Sonic common stock at an exercise price per share equal to the fair market value of a share of Sonic’s common stock on the date of grant. This option is subject to the terms of the granting contract, and to the terms of the applicable plan (a copy of which will be provided to you when your option is granted). Options issued under this plan are conditioned on your continued employment, are valid for ten years and are subject to a vesting schedule, with vesting to commence on date of grant. Under the vesting schedule applicable to your options, the first 25% of the shares will vest 12 months after the date of the grant, and the remaining 75% will vest on an equal monthly basis between the 13^th and 48^th months from date of grant (that is, at the rate of 2.08¹/3% per month).

In addition, upon or after the Closing, and subject to board approval, we will grant you restricted stock units (“RSUs”) for 25,000 shares of Sonic common stock. These RSUs are subject to the terms of the granting contract, and to the terms of the applicable plan (a copy of which will be provided to you when your RSUs are granted). RSUs issued under this plan are conditioned on your continued employment, are valid for ten years and are subject to a vesting schedule, with vesting to commence on the closest RSU vesting commencement date to the Closing (November 15, 2010). Under the vesting schedule applicable to your options, 12.5% of the shares will vest on May 15, 2011, and the remaining 87.5% will vest in 12.5% increments each 6 months thereafter (that is, on each subsequent November 15 and May 15 until fully vested).

Sonic, in its sole discretion, may offer you additional equity-based compensation in the future, the nature and size of any such grants would likely be in accordance with Sonic’s standard policies and practices relating to similarly-situated members of the Sonic management team.

Upon or shortly after the Closing, we will enter into a “Change in Control” agreement with you that is substantively identical to the agreements we have entered into with our other executive vice presidents. This agreement will provide that (i) if your employment is terminated without Cause or if you terminate your employment for Good Reason, unless such termination occurs within 180 days of a Change in Control, Sonic will make a lump sum payment to you equal to 100% of your annual base salary at the level in effect immediately prior to termination; and (ii) in the event of a Change in Control, all of your outstanding unvested stock options, restricted stock units and other equity compensation will immediately vest in full and Sonic will make a lump

sum payment to you equal to 100% of your annual base salary at the level in effect at the time of the Change in Control. For purposes of this agreement:

You will participate in DivX benefit programs, subject to changes as described in the FAQ document prepared by DivX and Sonic for DivX employees during the week of August 23, 2010. Your PTO will accrue at the rate of five (5) weeks per year. A complete summary of benefits is available at your request.

In our business, we generate a great deal of trade secret and proprietary material. All employees are expected, both during and after employment, to refrain from revealing or using such information materials for any purpose other than performing services to Sonic. As a condition of your employment, you will be required to sign our standard Proprietary Information and Inventions Agreement.

Except as otherwise provided in this agreement, your employment is at-will, that is, either you or Sonic may terminate the employment relationship at any time, with or without cause or notice.

As required by law, your employment is contingent on proof of eligibility to work in the United States. On your first day of work with Sonic, please be prepared to offer this proof and to return an executed copy of our Proprietary Information and Inventions Agreement.

This letter constitutes the entire statement of the terms of your employment and replaces any prior agreements or representations concerning your employment relationship with Sonic. It incorporates by reference all the terms and conditions that are applicable to all our employees as detailed in our Employee Handbook a copy of which will be provided to you upon your request.

To confirm your acceptance of this offer, please sign and date this letter in the space provided below, and return it to me. Please respond no later than October 1, 2010.

We very much look forward to having the opportunity to work with you. Everyone at Sonic looks forward to the Closing and to working closely with you and our other new colleagues from the DivX to achieve our overall company goals. You are joining us at an exciting and critical time - Sonic has the potential for tremendous growth and success, and we believe that you will play an instrumental role in our organization.

Very truly yours,

SONIC SOLUTIONS

David C. Habiger

President & CEO

This Severance Agreement (this “Agreement”), effective as of October 7, 2010 (the “Effective Date”), is made by and between Sonic Solutions (“Company”) and David Richter (“Executive”).

WHEREAS, as of the Effective Date, Executive commenced employment with Company as its Executive Vice President, Business Development; and

WHEREAS, as contemplated in the offer letter entered into by and between Company and Executive dated September 29, 2010 (the “Offer Letter”), the parties have agreed to certain terms and conditions relating to Executive’s severance agreement by Company;

NOW, THEREFORE, for and in consideration of the mutual promises, covenants and obligations contained herein, Company and Executive agree as follows:

1.1. Termination without Cause or for Good Reason. In the event that Executive’s employment is terminated by Company without Cause (as defined below) or voluntarily by Executive for Good Reason (as defined below) and unless such termination occurs within 180 days of a Change in Control (as defined below), Company shall provide Executive with a lump sum payment in an amount equal to 100% of Executive’s annual base salary at the level in effect immediately prior to his termination, less applicable deductions or withholdings. Notwithstanding any other provision of this Agreement to the contrary, if Executive is a “specified employee” within the meaning of Section 409A of the Internal Revenue Code (the “Code”) and the related final regulations and other guidance (“Section 409A”) at the time of Executive’s termination of employment, then only that portion of the payment provided by this Section that does not exceed the Section 409A Limit (as defined below) and which qualifies as separation pay under Treasury Regulation Section 1.409A-1(b)(9)(iii), may be paid within the thirty (30) days following Executive’s termination. Any portion of the payment that exceeds the Section 409A Limit will accrue during the six (6) month period following Executive’s termination and will become payable in a lump sum on the date six (6) months and one (1) day following such termination (or the next business day if such date is not a business day). For purposes of this Agreement, “Section 409A Limit” means the lesser of two (2) times: (i) Executive’s annual base salary paid to Executive during Company’s taxable year preceding the taxable year of Executive’s termination of employment as determined under Treasury Regulation Section 1.409A-1(b)(9)(iii)(A)(1) and any related Internal Revenue Service guidance; or (ii) the maximum amount that may be taken into account under a qualified plan pursuant to Section 401(a)(17) of the Code for the year in which such termination occurs.

1.2. Circumstances Under Which Termination Benefits Will Not Be Paid. Company shall not be obligated to provide Executive the termination benefits described in Section 1.1 if Executive’s employment is terminated by Company for Cause or if Executive voluntarily terminates his employment with Company other than for Good Reason. For purposes hereof, “Cause” shall mean (i) Executive’s conviction of any felony under federal or state law, or any fraud, misappropriation or embezzlement, or (ii) Executive’s failure to cure, within thirty (30) days of Executive’s receipt of written notice from Company, a breach of a fiduciary duty owed to Company or commission of a material violation of the terms set forth in the Invention and Confidential Information Agreement previously entered into by and between Executive and Company.

1.3. Termination for Good Reason. Executive may voluntarily terminate his employment with Company for Good Reason upon giving Company thirty (30) days’ written notice of the occurrence of any of the following without Executive’s consent and which has not been cured by Company within sixty (60) days of receipt of such notice from Executive:

2.1. Definition. For purposes of this Agreement, “Change in Control” shall have the same meaning as “Corporate Transaction,” as such term is defined in the Company’s 2004 Equity Compensation Plan.

2.2. Benefit Upon Change in Control. In the event of a Change in Control that is also a “change in control event” as determined under Section 409A, Company shall provide Executive with the following benefits:

3.1. Notices. For purposes of this Agreement, notices and all other communications provided for herein shall be in writing and shall be deemed to have been duly given when personally delivered or when mailed by United States registered or certified mail, return receipt requested, postage prepaid, addressed as follows:

or to such other address as either party may furnish to the other in writing in accordance herewith, except that notices of changes of address shall be effective only upon receipt.

3.2. Applicable Law. This Agreement will be governed by and construed in accordance with the laws of the state of California, as applied to agreements entered into and performed entirely within the state of California between residents of the state of California.

3.3. No Waiver. No waiver of any breach of any provision of this Agreement will constitute a waiver of any prior, concurrent or subsequent breach of the same or any other provisions hereof, and no waiver will be effective unless made in writing and signed by a duly authorized representative of the waiving party.

3.4. Severability. If for any reason a court of competent jurisdiction finds any provision of this Agreement, or portion thereof, to be unenforceable, that provision of the Agreement will be enforced to the maximum extent permissible so as to effect the intent of the parties, and the remainder of this Agreement will continue in full force and effect.

3.5. Counterparts. This Agreement may be executed in one or more counterparts, each of which shall be deemed to be an original, but all of which together will constitute one and the same Agreement.

3.6. Withholding of Taxes and Other Employment Deductions. Company may withhold from any benefits and payments made pursuant to this Agreement all federal, state, city and other taxes as may be required pursuant to any law or governmental regulation or ruling and all other normal employee deductions made with respect to Company’s employees generally.

3.7. Headings. The Section headings have been inserted for purposes of convenience and shall not be used for interpretive purposes.

3.8. Gender and Plurals. Wherever the context so requires, the masculine gender includes the feminine or neuter, and the singular number includes the plural and conversely.

3.9. Affiliate. As used in this Agreement, the term “affiliate” shall mean any entity which owns or controls, is owned or controlled by, or is under common ownership or control with, Company.

3.10. Assignment. This Agreement shall be binding upon and inure to the benefit of Company and any successor of Company, by merger or otherwise. Except as provided in the preceding sentence, this Agreement, and the rights and obligations of the parties hereunder, are personal and neither this Agreement, nor any right, benefit, or obligation of either party hereto, shall be subject to voluntary or involuntary assignment, alienation or transfer, whether by operation of law or otherwise, without the prior written consent of the other party.

(a) Except as provided in (i) written company policies promulgated by Company, (ii) the written benefits, plans, and programs made available by Company to Executive, (iii) the Offer Letter and (iv) any written agreements contemporaneously or hereafter executed by Company and Executive, this Agreement constitutes the entire agreement of the parties with regard to such Executive’s severance agreement with Company, and contains all of the covenants, promises, representations, warranties, and agreements between the parties with respect to Executive’s severance agreement with Company, and replaces and merges previous agreements and discussions pertaining to severance between Company and Executive. Each party to this Agreement acknowledges that no representation, inducement, promise or agreement, oral or written, has been made by either party, or by anyone acting on behalf of either party, which is not embodied herein, and that no agreement, statement, or promise relating to the employment of Executive by Company, which is not contained in this Agreement, shall be valid or binding. Any modification of this Agreement will be effective only if it is in writing and signed by the party to be charged.

(b) This Agreement is intended to comply with Section 409A of the Code (as amplified by any Internal Revenue Service or U.S. Treasury Department guidance), and shall be construed and interpreted in accordance with such intent. Executive and the Company agree to cooperate with one another and, to the extent reasonably requested by the other party, amend or modify this Agreement to restructure any compensation set forth in this Agreement in a manner, if possible and without any increase in cost to the Company, such that no earlier and/or additional taxes to Executive or the Company will arise under Code Section 409A. Any provision of this Agreement that would cause the payment of any benefit to fail to satisfy Section 409A of the Code shall have no force and effect until amended to comply with Code Section 409A (which amendment may be retroactive to the extent permitted by the Code or any regulations or rulings thereunder).

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the Effective Date.


		If to Company to:		Sonic Solutions 7250 Redwood Boulevard, Suite 300 Novato, CA 94945 Attention: General Counsel

		If to Executive to:		David Richter 3959 Washington St. San Francisco, CA 94118


David Richter		SONIC SOLUTIONS

By:	/s/ David Richter	By:	/s/ Paul F. Norris

Name:	David Richter	Name:	Paul F. Norris

		Title:	EVP, CFO and GC

Date:	December 14, 2010	Date:	December 20, 2010