You have to put the Signature, Expires and Key-Pair-Id strings

:
Code:
rtmpdump -r "rtmpe://siv5hr5zim87m.cloudfront.net/cfx/st/OSS/1/10111.flv?Expires=1326105209&Signature=WgE2mvAMEwFWb-IE2VNS9xGlpuHreuw8Iz0qhpxMPb8YDwjHMzmyOFdOF4ueWg1MKytWPsmIMEP3ZRJVHrQBYShXrXDLzFkwhV5tiMg-nxH6SRHxxjEyy5sopjFGJdxxL3CYGz9O6dk2BXvqwalIe5pqzxlnaegzwBfs36caxfw_&Key-Pair-Id=APKAJTNJJZKUHEEIE53Q" -o 10111.flv
Code:
RTMPDump v2.4 GIT-2011-12-22 (Compiled by KSV)
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
Connecting ...
INFO: Connected...
Starting download at: 0.000 kB
INFO: Metadata:
INFO: duration 777.00
INFO: width 452.00
INFO: height 338.00
INFO: videodatarate 384.00
INFO: framerate 15.00
INFO: videocodecid 4.00
INFO: audiodatarate 48.00
INFO: audiodelay 0.05
INFO: audiocodecid 2.00
INFO: canSeekToEnd TRUE
31.114 kB / 1.12 sec (0.1%)