I am very new to htaccess and the rules.
I need to stop people stealing video files (FLV, WMV) of my server, which are owned by copyright content owners. I have come across them on youtube

Plus, I want to stop them accessing XML playlist files (so to stop them being able to find the location of video files on the server).
People have used the full URL to download the videos i.e.
http://www.mysite.com/videos/intersport.flv
They then get the option to save or play the file from their browser. I want to stop this from happening.
Please tell me how I can stop them using htacess. There is a root htaccess file which works with the site's software. However, I can put a file in the videos folder but what does it need to contain???
Any help will be highly appreciated.