this is very interesting question but i give all solution for flash problem
if you show a content form other site like youtube then you use his javascript api
if you download video form youtube then use Firefox extension " Easy video downloader"
if you download a Flash content then adobe flash player not give a permission for download
so you can download by this technique
if you use Microsoft winfdow then go to C: & Document & Setting & Click your Current user name folder & Click on local settings & choose Temprery Internet Files folder you can see some flash content so you move it by using explorer bar ok
if you learn more about it contact me @ [email protected]
please give me vote
thanks for saying a interesting question