0001104659-03-021821 SC 13D/A 1 20030930 ACTV INC /DE/ 0000854152 3663 942907258 DE 1231 SC 13D/A 34 005-41394 03918131 1270 AVE OF THE AMERICAS NEW YORK NY 10020 2122622571 12270 AVE OF THE AMERICAS #2401 12270 AVE OF THE AMERICAS #2401 NEW YORK NY 10020 LIBERTY MEDIA CORP /DE/ 0001082114 4841 841288730 DE 1231 SC 13D/A 12300 LIBERTY BLVD. ENGLEWOOD CO 80112 7208755400 12300 LIBERTY BLVD. ENGLEWOOD CO 80112 SC 13D/A 1 a03-3694_1sc13da.htm SC 13D/A