**Exhibit 31.2**

 

**CERTIFICATION**

 

I, A. Clay Leighton, certify that: 

 

1. I have reviewed this annual report on Form 10-K of Sonic Solutions; 

 

2. Based on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this annual report; 

 

3. Based on my knowledge, the financial statements, and other financial information included in this annual report, fairly present in all material respects the financialcondition, results of operations and cash flows of the registrant as of, and for, the periods presented in this annual report; 

 

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange ActRules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and we have: 

 

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed underour supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this annual report is beingprepared; 

 

b) Designed such internal control over financialreporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for externalpurposes in accordance with generally accepted accounting principles; 

 

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this annual report to our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the periodcovered by this report based on such evaluation; and 

 

d)Disclosed in this annual report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annualreport) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and 

 

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to theregistrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions): 

 

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonablylikely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and 

 

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controlsand control over financial reporting. 

 

Date:June 29, 2005