| x | ANNUAL      REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF      1934 |
|---|------------------------------------------------------------------------------------------------|

|  ̈ | TRANSITION REPORT PURSUANT TO      SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF      1934 |
|--------|----------------------------------------------------------------------------------------------------|

|                                                                    |   |                                       |
|-------------------------------------------------------------------------|--------|--------------------------------------------|
|                                                                    |   |                                       |
| California                                                              |   | 93-0925818                                 |
| (State      or other jurisdiction ofincorporation      or organization) |   | (IRS      EmployerIdentification      No.) |
|                                                                    |   |
| 7250      Redwood Boulevard, Suite 300Novato,      California           |   | 94945                                      |
| (Address      of principal executive offices)                           |   | (Zip      Code)                            |

| Title of each class |   | Name of each exchange on which registered |
|------------------------------------|--------|-------------------------------------------------------------------------|
| Common      Stock, no par value    |   | The      Nasdaq Stock Market LLC                                        |

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| Explanatory      Note                           |   | 2 |
|-------------------------------------------------|--------|---|
| Exhibits      and Financial Statement Schedules |   | 3 |
| Signatures                                      |   | 6 |

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PART IV

| Exhibit         |   | Note        |   | Title                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------|--------|-------------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|  3.1  |   | (20)        |   | Restated      Articles of Incorporation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|  3.2  |   | (21)        |   | Amended      and Restated By-Laws                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|  4.1  |   | (1)         |   | Specimen      Common Stock Certificate                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| 10.1       |   | (2)         |   | Lease      Agreement between Golden Gate Plaza and Registrant, dated January 26,      1995                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| 10.2       |   | (13)        |   | Amendment      to Lease Agreement between Golden Gate Plaza and Registrant, dated      November 20, 2000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| 10.3       |   | (12)        |   | Tri-Partite      Agreement between Roxio, Inc., Registrant and Entrust, Inc., dated      December 17, 2004                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| 10.4       |   | (12)        |   | Third      Amendment to Lease between C&B Ventures-Napa Two LLC and Registrant,      dated February 4, 2005                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| 10.5       |   | (4)         |   | Distribution      Agreement between Registrant and Daikin Industries, Ltd., dated February      27, 2001                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| 10.6       |   | (1)         |   | Form      of Indemnity Agreement                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| 10.7            |   | (3)         |   | 1998      Stock Option Plan (compensatory plan)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| 10.8            |   | (9)         |   | Sonic      Solutions 2004 Equity Compensation Plan                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| 10.9            |   | (9)         |   | Sonic      Solutions 2004 Equity Compensation Plan Notice of Stock Option Award for      Robert J. Doris and Stock Option Award Agreement                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| 10.10           |   | (9)         |   | Sonic      Solutions 2004 Equity Compensation Plan Notice of Stock Option Award for      Mary C. Sauer and Stock Option Award Agreement                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| 10.11           |   | (9)         |   | Sonic      Solutions 2004 Equity Compensation Plan Notice of Stock Option Award for      Robert Greber and Stock Option Award Agreement                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| 10.12           |   | (9)         |   | Sonic      Solutions 2004 Equity Compensation Plan Notice of Stock Option Award for      Peter Marguglio and Stock Option Award Agreement                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| 10.13           |   | (9)         |   | Sonic      Solutions 2004 Equity Compensation Plan Notice of Stock Option Award for      Warren R. Langley and Stock Option Award Agreement                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| 10.14           |   | (10)        |   | Sonic      Solutions 2004 Stock Incentive Plan                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 10.15           |   | (14)        |   | Sonic      Solutions 2005 Stock Incentive Plan (Non-U.S.Employees)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| 10.16           |   | (15)        |   | Third      Sublease Amending Agreement between Entrust, Inc. and Sonic Solutions      dated July 5, 2006                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| 10.17           |   | (16)        |   | Executive      Employment Agreement, effective as of January 23, 2007, by and between      Sonic Solutions and David C. Habiger                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| 10.18           |   | (16)        |   | Executive      Employment Agreement, effective as of January 23, 2007, by and between      Sonic Solutions and A. Clay Leighton                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| 10.19           |   | (16)        |   | Executive      Employment Agreement, effective as of January 23, 2007, by and between      Sonic Solutions and Mark Ely                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| 10.20           |   | (17)        |   | Amended      and Restated Executive Employment Agreement, effective as of February 25,      2008 hereof, by and between Sonic Solutions and Paul F.    Norris                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| 10.21           |   | (18)        |   | Board      of Directors Compensation Policy, effective as of June 12,      2008                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| 10.22           |   | (19)‡ |   | General      Terms and Conditions entered into as of August 18, 2005 between Registrant      and Digital River, Inc., Reseller Agreement      effective as of August 18, 2005 between Registrant and Digital River,      Inc., and Amendment No. 2 to Digital River Reseller Agreement entered into      as of January 1, 2007 between Registrant and Digital River,      Inc.                                                                                                                                                                                                                                                                                                                                             |
| 10.23           |   | *‡    |   | Distribution      Agreement entered into as of March 28, 2002 between Registrant and Navarre      Distribution Services, Inc. , Letter dated December 17, 2004 from      Registrant to Navarre Distribution Services, Inc., Letter dated December      7, 2006 from Navarre Distribution Services, Inc. to Registrant, General      Terms and Conditions for Consignment Programs Rider dated September 11,      2007 to Computer Software Distribution Agreement between Registrant and      Navarre Distribution Services, Inc. and General      Terms and Conditions for Digital Distribution Rider dated March 28, 2002      to Distribution Agreement between Registrant and Navarre Distribution      Services, Inc. |

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| 10.24 |   | (22) |   | Executive      Employment Agreement, effective as of March 18, 2008, by and between Sonic      Solutions and Matthew DiMaria. |
|-------|--------|------|--------|-------------------------------------------------------------------------------------------------------------------------------|
| 21.1  |   | (23) |   | List      of subsidiaries                                                                                                     |
| 23.1  |   | (24) |   | Consent      of Armanino McKenna, LLP, Independent Registered Public Accounting      Firm                                     |
| 23.2  |   | (25) |   | Consent      of BDO Seidman, LLP, LLP, Independent Registered Public Accounting      Firm                                     |
| 31.1  |   | *    |   | Rule      13a-14(a)/15d-14(a) Certification of Chief Executive    Officer                                                     |
| 31.2  |   | *    |   | Rule      13a-14(a)/15d-14(a) Certification of Chief Financial    Officer                                                     |
| 32.1  |   | (26) |   | Section      1350 Certification of Chief Executive Officer                                                                    |
| 32.2  |   | (27) |   | Section      1350 Certification of Chief FinancialOfficer                                                                     |

| Note       |   | Title                                                                                                                                                     |
|------------|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| ‡    |   | Confidential      treatment has been requested for portions of this  exhibit.                                                                             |
| *          |   | Filed      herewith.                                                                                                                                      |
| (1)        |   | Incorporated      by reference to exhibits to Registration Statement on Form S-1 effective      February 10, 1994.                                        |
| (2)        |   | Incorporated      by reference to exhibits to Annual Report on Form 10-K for the fiscal year      ended March 31, 1996.                                   |
| (3)        |   | Incorporated      by reference to Appendix A to the Registrant s Definitive Proxy Statement      filed on July 21, 1998.                                  |
| (4)        |   | Incorporated      by reference to exhibits to Current Report on Form 8-K filed on March 14,      2001.                                                    |
| (5)        |   | Incorporated      by reference to exhibits to Current Report on Form 8-K filed on December      19, 2001.                                                 |
| (6)        |   | Incorporated      by reference to exhibits to Current Report on Form 8-K filed on November      20, 2002.                                                 |
| (7)        |   | Incorporated      by reference to Exhibit 3.5 to Report on Form 10-Q filed on November 12,      2003.                                                     |
| (8)        |   | Incorporated      by reference to Exhibit 99.1 to Current Report on Form 8-K filed on March      1, 2004.                                                 |
| (9)        |   | Incorporated      by reference to exhibits to Current Report on Form 8-K filed on September      13, 2004.                                                |
| (10)       |   | Incorporated      by reference to Exhibit 10.7 to Quarterly Report on Form 10-Q for the      quarter ended September 30, 2004.                            |
| (11)       |   | Incorporated      by reference to Exhibit 2.1 to Current Report on Form 8-K filed December      23, 2004.                                                 |
| (12)       |   | Incorporated      by reference to exhibits to Quarterly Report on Form 10-Q for the quarter      ended December 31, 2004.                                 |
| (13)       |   | Incorporated      by reference to exhibits to Registration Statement on Form S-1 effective      May 21, 2001.                                             |
| (14)       |   | Incorporated      by reference to Exhibit 10.21 to Annual Report on Form 10-K for the year      ended March 31, 2005.                                     |
| (15)       |   | Incorporated      by reference to Exhibit 10.1 to Report on Form 10-Q filed on August 14,      2006.                                                      |
| (16)       |   | Incorporated      by reference to exhibits to Current Report on Form 8-K filed on January      24, 2007.                                                  |
| (17)       |   | Incorporated      by reference to Exhibit 10.1 to Current Report on Form 8-K filed on      February 25, 2008.                                             |
| (18)       |   | Incorporated      by reference to Exhibit 10.1 to Current Report on Form 8-K filed on June      16, 2008.                                                 |
| (19)  |   | Incorporated      by reference to Exhibit 10.22 to Annual Report on Form 10-K/A for the      fiscal year ended March 31, 2009 filed on February 5,  2010. |

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| (20) |   | Incorporated      by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K      filed on July 12, 2010. |
|------|--------|---------------------------------------------------------------------------------------------------------------------------------|
| (21) |   | Incorporated      by reference to Exhibit 3.2 to the Registrant’s Current Report on Form 8-K      filed on July 12, 2010. |
| (22) |   | Incorporated      by reference to Exhibit 10.24 to Annual Report on Form 10-K for the year      ended March 31, 2010.           |
| (23) |   | Incorporated      by reference to Exhibit 21.1 to Annual Report on Form 10-K for the year      ended March 31, 2010.            |
| (24) |   | Incorporated      by reference to Exhibit 23.1 to Annual Report on Form 10-K for the year      ended March 31, 2010.            |
| (25) |   | Incorporated      by reference to Exhibit 23.2 to Annual Report on Form 10-K for the year      ended March 31, 2010.            |
| (26) |   | Incorporated      by reference to Exhibit 32.1 to Annual Report on Form 10-K for the year      ended March 31, 2010.            |
| (27) |   | Incorporated      by reference to Exhibit 32.2 to Annual Report on Form 10-K for the year      ended March 31, 2010.            |

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|   | SONIC      SOLUTIONS |
|--------|----------------------|
|   |                 |   |
|   | By:             | /s/      David C. Habiger |
|   |                 |   |
|   |                 | David      C. HabigerPresident      and Chief Executive Officer |
|   |                 |   |
|   | By:                  | /s/      Paul F. Norris |
|   |                 |   |
|   |                 | Paul      F. NorrisExecutive      Vice President,Chief      Financial Officer and GeneralCounsel |

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| 10.23 |   | *‡ |   | Distribution      Agreement entered into as of March 28, 2002 between Registrant and Navarre      Distribution Services, Inc. , Letter dated December 17, 2004 from      Registrant to Navarre Distribution Services, Inc., Letter dated December      7, 2006 from Navarre Distribution Services, Inc. to Registrant, General      Terms and Conditions for Consignment Programs Rider dated September 11,      2007 to Computer Software Distribution Agreement between Registrant and      Navarre Distribution Services, Inc. and General      Terms and Conditions for Digital Distribution Rider dated March 28, 2002      to Distribution Agreement between Registrant and Navarre Distribution      Services, Inc. |
|-------|--------|----------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 31.1  |   | *        |   | Rule      13a-14(a)/15d-14(a) Certification of Chief Executive    Officer                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| 31.2  |   | *        |   | Rule      13a-14(a)/15d-14(a) Certification of Chief Financial    Officer                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |

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