[aruss]

iO isn't going to be used in video games for a long time, if ever. For one, even if it had no overhead, it'd completely ruin any optimizations that the devs needed for the game to run in the real world. But likely iO will add a huge overhead, degrading performance by at least a quadratic factor or more. iO also doesn't consider things like syscalls or hardware instructions, which might break the security model anyway.

Video/music DRM wouldn't (couldn't?) change from what it is now: the plaintext bits have to be surfaced to the user at some level (so that it can be displayed/played), so they can simply be ripped at that point.

[sterlind]

Not even theoretically possible, as far as I can tell. If iO is protecting your decryption key, then any indistinguishable circuit would also include your decryption key in some form.

I'm having trouble thinking of cases where iO gives you any actual guarantees that matter, because of this property.

[aruss]

If you're interested, check out the paper called "How to Use Indistinguishability Obfuscation" by Sahai and Waters. They were able to prove some very surprising things -- including how to hide a private key by way of iO.

[anotheryou]

Why would you need to use iO on everything? Wouldn't it be enough to use it on computational inexpensive but vital parts?