SWFMovie_setNetworkAccess - sets SWF network / fileaccess policy
If the flag is set to 0 a localy loaded movie will be unable to access the network
but is allowed to access local files
If the flag ist set to 1 a localy loaded movie will be unable to access local files
but is allowed to access the network
See also http://www.adobe.com/devnet/flash/articles/fplayer8_security.html
For SWF >= 8: default is 0.