Re: Digital Rights Management - An idea (limited lease, renting, expiration, verification) NON HAR*D*WARE BASED.

["Dean McEwan" <dean_mcewan@linuxmail.org>]

----- Original Message -----
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Date: 14 May 2003 14:49:03 +0100 
To: Dean McEwan <dean_mcewan@linuxmail.org>
Subject: Re: Digital Rights Management - An idea (limited lease, renting, expiration, verification) NON HARWARE BASED.

> On Mer, 2003-05-14 at 14:52, Dean McEwan wrote:
> > It would be set up so that files have an internal signature (ELF format might have to be
> > fiddled with). It would verify itself by sending info to the creator of the contents PC OR server
> > asking for verification of itself, files could be limited lease, rented, or automatically expire 
> > after some time.
> 
> That way around doesnt actually work because I'll simply lie, fake the server or firewall you

Encrypted binary, in a XML wrapper that needs decryption key from owners site.
Uses port 80...
> (in fact any serious business firewalls all outgoing traffic from end users). If you want
> to do it for internal trust and you control the systems (the useful case) you set SELinux
> or RSBAC up so that all applications create files in a "non runnable" class. The only way
> to transition an app is a single user application which does your key checking and other
> processing then transitions the binary to "safe". I guess you also add a general rule that
> writing to a file moves it back into non runnable.
> 
> One of the problems with this is interpreters. Its easy to do this with ELF binaries but
> you have to extend it to scripts and that normally means more pain 8)
> 
> 
> 

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