Performance

[Ryan Malayter]

MPEG is just a compressed video format. AFAIK, no encryption algorithm is
part of the MPEG2 standard.

Perhaps you're thinking about DVD encryption. Commercial DVDs are
essentially a collection of encrypted MPEG2 files. The CSS encryption
algorithm is applied on top of the plain-vanilla MPEG2-data streams. DVD
hacking tools like DeCSS simply decrypt the DVD data streams and output
normal MPEG2 files that any MPEG2 software can use.

:::Ryan Malayter, MCSE
:::Bank Administration Institute
:::Chicago, Illinois, USA
-------------------
"In order to understand the stock market we have to realize that, like
anything enormous and inert, it's fundamentally stable, and, like anything
emotion-driven, it's volatile as hell. Got that? Me neither." -P.J. O'Rourke



-----Original Message-----
From: Walt Mankowski [mailto:waltman@pobox.com] 
Sent: Monday, November 19, 2001 12:01 PM
To: gnupg-users@gnupg.org
Subject: Re: Performance


On Mon, Nov 19, 2001 at 11:43:49AM -0600, Lee McKenna wrote:
> The file is an MPEG2 movie.  We've experimented with compression -z
> options, but we found it of no use on these MPEG2 files (in fact, 
> detrimental to speed and file size), hence the -z0 in our script.

I believe MPEG2 files are already encrypted.

Walt