Cablevision 2012 Annual Report Download - page 216

Exhibit 31.1
I, James L. Dolan, President and Chief Executive Officer of Cablevision Systems Corporation and CSC
Holdings, LLC (the "Registrants") certify that:
1. I have reviewed this annual report on Form 10-K of the Registrants;
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 statements made, 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 financial condition, results of operations and cash
flows of the Registrants as of, and for, the periods presented in this annual report;
4. The Registrants' other certifying officers and I are responsible for establishing and maintaining
disclosure controls and procedures (as defined in Exchange Act Rules 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 Registrants and have:
a) designed such disclosure controls and procedures, or caused such disclosure controls and
procedures to be designed under our supervision, to ensure that material information relating to the
Registrants, including their consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this annual report is being prepared;
b) designed such internal control over financial reporting, 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 external purposes
in accordance with generally accepted accounting principles;
c) evaluated the effectiveness of the Registrants' disclosure controls and procedures and
presented in this annual report our conclusions about the effectiveness of the disclosure controls
and procedures as of the end of the period covered by this annual report based on such evaluation;
and
d) disclosed in this annual report any change in the Registrants' internal control over financial
reporting that occurred during the Registrants' most recent fiscal quarter (the Registrants' fourth
fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to
materially affect, the Registrants' internal control over financial reporting; and
5. The Registrants' other certifying officers and I have disclosed, based on our most recent evaluation
of internal control over financial reporting, to the Registrants' auditors and the audit committee of each
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 reasonably likely to adversely affect the
Registrants' 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 Registrants' internal control over financial reporting.
Date: February 28, 2013 By: /s/ James L. Dolan
James L. Dolan
President and Chief Executive Officer