Filed by CSR plc Pursuant to Rule 425

Under the Securities Act of 1933

And Deemed Filed Pursuant to Rule 14a-12

Under the Securities Exchange Act of 1934

Subject Company: Zoran Corporation

Commission File No.: 000-27246

CSR and Zoran – merging to create a global leader in connectivity, location, imaging and audio

Dear valued customer of CSR,

I am pleased to announce that CSR has entered into a merger agreement under which Zoran – a provider of market leading imaging technologies for digital camera, home entertainment and multifunction printer products - will merge with CSR PLC.

The coming together of CSR and Zoran creates a world class, top 10 fabless semiconductor organisation in the fields of connectivity, location, imaging and audio that we hope will earn the role of your partner of choice.

I am very excited by the compelling product synergies between Zoran and CSR’s businesses. Already the leader in Bluetooth and GPS, this merger positions the company to lead in an even wider range of video and imaging technologies and applications.

Combining CSR and Zoran’s two highly complementary technology portfolios will uniquely position us to deliver advanced platforms to capture and stream media-rich content, which we believe will strengthen our customers’ ability to provide differentiated and desirable products to the end consumer.

Zoran is headquartered in Sunnyvale, California. The team has a track record in IC design, algorithm development, and system integration, and a very strong IP portfolio, which includes leading low-light imaging, innovative frame rate conversion algorithms, motion compensation technology and 3D imaging capabilities.

By working together, we will be able to reduce costs and improve our operations. This in turn will enable us to provide more valuable service and support to you.

We are committed to making the process of integrating our two companies seamless to you. Our pledge to putting customers first means that the employees of CSR and Zoran will make every effort to ensure that your every-day interactions with us go smoothly.

Completion is expected in the second quarter of 2011 and is subject to CSR and Zoran shareholder and regulatory approvals and other customary closing conditions.

On behalf of the employees and staff of CSR and Zoran, I would like to thank you for letting us work with you in the past and we look forward to many more years of consumer-driven innovation together. In the meantime, if you have any questions, please do not hesitate to contact                             .

Thank you again for your support,

Kind regards,

Charlie Lesko

Senior Vice President of Sales

CSR PLC

Access our regulatory announcement on the CSR and Zoran merger.

Forward-looking statements

This communication contains, or may contain, ‘forward-looking statements’ concerning CSR and Zoran (together such companies and their subsidiaries being the “Merged Company”) that are subject to risks and uncertainties. Generally, the words ‘will’, ‘may’, ‘should’, ‘continue’, ‘believes’, ‘targets’, ‘plans’, ‘expects’, ‘estimates’, ‘aims’, ‘intends’, ‘anticipates’ or similar expressions or negatives thereof identify forward-looking statements. Forward-looking statements include statements relating to the following: (i) the expected benefits of the Merger, the expected accretive effect of the Merger on the Merged Company’s financial results, expected cost, revenue, technology and other synergies, the expected impact for customers and end-users, future capital expenditures, expenses, revenues, earnings, synergies, economic performance, financial condition, losses and future prospects; (ii) business and management strategies and the expansion and growth of CSR’s or Zoran’s operations and potential synergies resulting from the Merger; (iii) the effects of government regulation on CSR’s, Zoran’s or the Merged Company’s business; and (iv) the proposed share buyback and (v) the anticipated timing of shareholder meetings and completion.

These forward-looking statements are based upon the current beliefs and expectations of the management of CSR and involve risks and uncertainties that could cause actual results to differ materially from those expressed in the forward-looking statements. Many of these risks and uncertainties relate to factors that are beyond CSR’s and Zoran’s ability to control or estimate precisely and include, without limitation: the ability to obtain governmental approvals of the Merger or to satisfy other conditions to the Merger on the proposed terms and timeframe; the possibility that the Merger does not close when expected or at all, or that the companies may be required to modify aspects of the Merger to achieve regulatory approval; the ability to realize the expected synergies from the Merger in the amounts or in the timeframe anticipated; the potential harm to customer, supplier, employee and other relationships caused by the

announcement or closing of the Merger; the ability to integrate Zoran’s businesses into those of CSR’s in a timely and cost-efficient manner; the development of the markets for Zoran’s and CSR’s products; the Merged Company’s ability to develop and market products containing the respective technologies of Zoran and CSR in a timely and cost-effective manner; economic conditions and the difficulty in predicting sales, even in the short-term; factors affecting the quarterly results of CSR, Zoran and the Merged Company; sales cycles; price reductions; dependence on and qualification of foundries to manufacture the products of CSR, Zoran and the Merged Company; production capacity; the ability to adequately forecast demand; customer relationships; the ability of CSR, Zoran and the Merged Company to compete successfully; product warranties; the impact of legal proceedings; the impact of intellectual property indemnification practices; and other risks and uncertainties, including those detailed from time to time in CSR’s and Zoran’s periodic reports (whether under the caption Risk Factors or Forward Looking Statements or elsewhere), which are available at the SEC’s web site http://www.sec.gov. Neither CSR nor Zoran can give any assurance that such forward-looking statements will prove to have been correct. The reader is cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this presentation. Neither CSR nor Zoran nor any other person undertakes any obligation to update or revise publicly any of the forward-looking statements set out herein, whether as a result of new information, future events or otherwise, except to the extent legally required.

Nothing contained herein shall be deemed to be a forecast, projection or estimate of the future financial performance of CSR, Zoran, or the Merged Company, following the implementation of the Merger or otherwise. No statement in this presentation should be interpreted to mean that the earnings per share, profits, margins or cash flows of CSR for the current or future financial years would necessarily match or exceed the historical published figures.

Additional Information and Where to Find It

This communication may be deemed to be solicitation material in respect of the proposed Merger involving CSR and Zoran. In connection with the proposed Merger, CSR intends to file with the US Securities and Exchange Commission (the “SEC”) a registration statement on Form F-4 containing a proxy statement/prospectus (the “Proxy Statement/Prospectus”) for the stockholders of Zoran. In connection with the consent solicitation by Ramius, Zoran has filed with the SEC a preliminary consent revocation statement and plans to file a final consent revocation statement (the “Consent Revocation Statement”). Each of CSR and Zoran plan to file other documents with the SEC regarding the proposed merger. WE URGE INVESTORS TO READ THE PROXY STATEMENT/PROSPECTUS, THE REGISTRATION STATEMENT ON FORM F-4 AND THE CONSENT REVOCATION STATEMENT (INCLUDING ANY SUPPLEMENTS THERETO) AND ANY OTHER RELEVANT DOCUMENTS THAT CSR OR ZORAN FILE WITH THE SEC WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION. Stockholders will be able to obtain, free of charge, copies of the Proxy Statement/Prospectus, the Registration Statement on Form

F-4, the Consent Revocation Statement and any other documents filed by CSR or Zoran with the SEC in connection with the proposed merger at the SEC’s website at http://www.sec.gov, at Zoran’s website at http://www.Zoran.com, and at CSR’s website at http://www.CSR.com.

Important Additional Information regarding solicitation of Zoran proxies

Zoran and its directors and certain executive officers and CSR, its directors and officers may be deemed to be participants in the solicitation of proxies from stockholders in connection with the approval of the proposed transaction and/or in connection with the consent solicitation by Ramius. CSR plans to file the Proxy Statement/Prospectus and Registration Statement with the SEC in connection with the solicitation of proxies to approve the proposed transaction. In addition, in connection with the consent solicitation by Ramius, Zoran has filed with the SEC a preliminary consent revocation statement and plans to file the final Consent Revocation Statement. Information regarding the names of Zoran’s directors and executive officers and their respective interests in Zoran by security holdings or otherwise is set forth in Zoran’s proxy statement relating to the 2010 annual meeting of stockholders, which may be obtained free of charge at the SEC’s website at http://www.sec.gov and Zoran’s website at http://www.Zoran.com. Information about CSR’s directors and executive officers is set forth in CSR’s annual report for the financial period ended 2 January 2009, which may be obtained free of charge at the SEC’s website at http://www.sec.gov and at CSR’s website at http://www.CSR.com. Additional information regarding the interests of such potential participants will be included in the Proxy Statement/Prospectus and Registration Statement, the consent revocation statement filed by Zoran with the SEC and other relevant documents to be filed with the SEC in connection with the solicitation of proxies to approve the proposed transaction and to elect directors.