This excerpt taken from the CMCSA 8-K filed Apr 26, 2005.
Registration Rights Agreement
In conjunction with the restructuring of TWE completed in 2003 (the TWE Restructuring), TWC granted Comcast Trust II registration rights relating to the shares of TWC Class A Common Stock acquired by it in the TWE Restructuring. In December 2003, Comcast Trust II requested that TWC register its shares of TWC Class A Common Stock for sale in a public offering. Pursuant to the TWC Redemption Agreement, Comcast Trust II has agreed not to exercise or pursue registration rights with respect to the TWC Class A Common Stock owned by it until the earlier of (i) the date upon which the TWC Redemption Agreement is terminated in accordance with its terms and (ii) the date upon which TWCs offering of securities to the public for cash for its own account in one or more transactions registered under the Securities Act of 1933, as amended (other than as consideration in an acquisition transaction or as compensation to employees), exceeds $2.1 billion. Among other things, the parties have agreed that Comcast Trust II will have full priority in respect of any request by it to register its shares of TWC Class A Common Stock for a period to begin on November 1, 2006 and ending on November 18, 2007. TWC has also agreed to use all commercially reasonable efforts to file a shelf registration statement on June 1, 2006 registering the resale of all shares of TWC Class A Common Stock held by Comcast Trust II.