Password protection is annoying, serves no purpose at all.

Changing the filename will help if it's a bot randomly searching Google for release names, but if it's actually searching for the title itself ie: "Inception 2010 Download" or any other term, that wouldn't help at all.

Unless you're going to change your whole post from the real thing to something fake, which would basically mean no one will know what's what lol.

Have a private mirror, for example, upload one to Rapidshare and post them, another one on Megaupload but keep it private, don't share, if RS link dies, remote upload from MU, which will take a couple of minutes and ultimately keep your post alive.

Or just get a Netflix subscription, which owns. Netflix ftw.