Now one of the major manufacturers of data recorders says the company will look to extend their battery life to give authorities more time to find them after a crash.

CNN: Flight 447 sparks black box rethink

Broadcasters will not deliberately try to make life more difficult for viewers and listeners in the digital age of personal video recorders and IPTV, but they will have to work with content owners who are lobbying hard to protect their copyrighted assets through, for example, automatic expiry on programmes.

BBC: Digital broadcasting: Industry answers