I'd personally want to do a daemonized process so I and anyone else would be none the wiser, with a randomized delay of under a minute after the lid was opened.

I'd personally want to do a daemonized process so I and anyone else would be none the wiser, with a randomized delay of under a minute after the lid was opened. Regarding privacy? I doubt anyone would get into any sort of trouble with it. If it's your laptop, you can install whatever you want on it, even rootkits and keyloggers.