UNITED STATES

SECURITIES AND EXCHANGE
COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Item 1.

Security and Issuer

This statement on Schedule 13D (the “Schedule 13D”) relates to shares of common stock, par value $.01 per share (the “Common Stock”), of International Fight League, Inc., a Delaware corporation, formerly known as Paligent, Inc. (the “Company”).  The principal executive offices of the Company are located at 424 West 33rd Street, Suite 650, New York, New York 10001.

Prior to November 29, 2006, the Company was known as Paligent Inc., a Delaware corporation.  On November 29, 2006, the Company acquired International Fight League, Inc., a privately held Delaware corporation (“Old IFL”), pursuant to an agreement and plan of merger, dated as of August 25, 2006, as amended (the “Merger Agreement”), by and among the Company, IFL Corp., a Delaware corporation and wholly-owned subsidiary of the Company (“Merger Sub”), and Old IFL, providing for the merger of Merger Sub and Old IFL, with Old IFL being the surviving corporation and becoming our wholly-owned subsidiary (the “Merger”).  Immediately following the Merger, the Company changed its name to International Fight League, Inc., Old IFL changed its name to IFL Corp., and we began operating Old IFL’s business of organizing and promoting a mixed martial arts sports league.

Item 2.

Identity and Background

This Schedule 13D is being filed by Keith Otto.  Mr. Otto’s principal occupation is National Sales Director for Primerica Life Insurance Co., a Georgia company with a principal business address of 3120 Breckinridge Blvd., Duluth, GA 30099. Mr. Otto’s business address is 560 Sylvan Avenue, Englewood Cliffs, NJ 07632. Mr. Otto is a citizen of the United States. 

During the last five years, Mr. Otto has not been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).  During the last five years, Mr. Otto has not been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction as a result of which he was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

Item 3.

Source and Amount of Funds or Other Consideration

Mr. Otto acquired the 2,594,190 shares of Common Stock on November 29, 2006, in exchange for his 2,512,841 shares of Old IFL common stock as part of the Merger.

Item 4.

Purpose of Transaction

Pursuant to the Merger Agreement, attached hereto as Exhibit 1, the Company issued 1.032373 shares of Common Stock in the Merger in exchange for each issued and outstanding share of Old IFL common stock.  Mr. Otto received 2,594,190 shares of Common Stock in the Merger in exchange for his shares of Old IFL common stock. 

Mr. Otto does not have any present plans or intentions which would result in or relate to any of the matters set forth in subparagraphs (a) through (j) of Item 4 of Schedule 13D.

Item 5.

Interest in Securities of the Issuer

(a)-(b)   Following the Merger and the conversion into shares of Common Stock of certain Company indebtedness held by one of the members of its board of directors, there were 34,124,448 shares of Common Stock issued and outstanding on November 29, 2006.  Mr. Otto has the power to vote and direct

the disposition of 2,594,190 shares of Common Stock, and for the purposes of Reg. Section 240.13d-3 is deemed to beneficially own 7.6%, of the issued and outstanding shares of Common Stock.

(c)         The only transactions effected by Mr. Otto in shares of Common Stock or securities convertible into, or exercisable or exchangeable for, Common Stock, during the sixty days prior to November 29, 2006 are described in Item 3 of this Schedule 13D.

(d)         Except as described in this Schedule 13D, no other shares of Common Stock are owned, beneficially or otherwise, by Mr. Otto.

Item 6.

Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer

No contracts, arrangements, understandings or similar relationships exist with respect to the securities of the Company between Mr. Otto and any other individual or entity.  No other person is known by Mr. Otto to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Common Stock beneficially owned by Mr. Otto.

Item 7.

Material to Be Filed as Exhibits

           1.

Agreement and Plan of Merger, among the Company, Merger Sub, and Old IFL, dated as of August 25, 2006 (incorporated by reference to Annex A to the Company’s amended Schedule 14A filed on October 31, 2006).

December 11, 2006

Date

/s/ Keith Otto

Signature

Keith Otto

Name/Title