solution based on http://flowplayer.org/plugins/streaming/secure.html
http://flowplayer.org/forum/5/28824
+
1) put .htaccess from 'private' folder of this module to the folder with your private files 
(or use private_upload module for this http://drupal.org/project/private_upload)

2) download and install flowplayer module http://drupal.org/project/flowplayer
you will be promt to download flowplayer swf file http://flowplayer.org/download/index.html

3) download secure plugin swf file http://flowplayer.org/plugins/streaming/secure.html#download 
rename to 'flowplayer.securestreaming.swf' (withour version) and put it to the 'flowplayer' folder of this module
so that 'flowplayer/flowplayer.securestreaming.swf' file exists

4) if you are using filefiled or video modules - go to Content management  Content types  [Your type here] -> Display fields
and select 'Video player (Flowplayer secure plugin, flv only)' format for file fied
Use css for ".flowplayer" to change wight and height (video module dimentions are already supported)

5) if you are using any module that use theme('flowplayer') this theme is already rewrited in flowplayer_secure module.
so - do nothing

5) if you or any other module is usung flowplayer_add() function (like blue drop video module) - 
use flowplayer_secure_add() function instead:
E.g. for blue drop video module go to 'bd_video/includes/player.inc' file
and replace 'flowplayer_add' function (~line 238) to 'flowplayer_secure_add' function 
parameters are the same
