make data available for a certain amount of time

Sander de Bakker n00bical at
Thu Jul 10 14:32:20 CEST 2008

Hello Faramir and Robert,

thank you for the responses.

I want everyone to be able to acces the data as long as the data is valid.
When the data becomes invalid i want it to be inaccesible for everyone.

I want to control and force when the data should be invalid, i was thinking
of using the expiration of a gpg key.

Any suggestions are appreciated.


On 7/10/08, Faramir < at> wrote:
> Hash: SHA256
> Sander de Bakker escribió:
> > Hello list,
> >
> > I want to know if it is possible with gpg to offer data for a certain
> > amount of time.
> >
> > I want to do the following :
> >
> > I create a website and pack it in a zip file
> > when a complete stranger opens the website in the zip it checks for a
> > valid key on a keyserver.
> >
> > when they key is valid the site opens
> > when the key is invalid the website never opens and the contentfiles of
> > the website in the zipfile cannot be accessed in any way
> >
> > thanks in advance for your replies
> You need DRM software... I have tried Locklizard, it looks very
> good... and very expensive too. I am still thinking there may be a
> cheaper alternative... but I think it is unlikely to find a Gnu version
> of those programs... ok, I know free software doesn't mean absence of
> copyright, but I *feel* Gnu people would focus the subjet in a different
> way... it's not something I can express with words, just a "feeling".
> What locklizard does, it is to encrypt the document, lets say, a pdf
> file, which now can only be open with a special (free) viewer...
> basically, a pdf viewer with other functions (FileOpen, another DRM
> company, uses a pluging for adobe acrobat reader). The viewer checks for
> a user ID in the computer (which is sent to the user, and I don't know
> how do it identifies the computer... but supposedly, it can't be copied
> to another computer), and then connects to an internet hosted database,
> checks the user rights to access the document, and then grant or deny
> the document. It can be configured to restrict some rights, or
> everything, and also the frequency (for each document) the reader checks
> the current status of the user, in the online database. They have
> solutions for websites too, but I don't know how does it work.
>   I write this just to see if this is what you need... and maybe
> somebody will say: "hey, you are wrong, there are free software
> alternatives for that".
> Best Regards
> P.S: sorry for the off topic, I don't intend to keep on the subject,
> unless it returns to gpg, or unless other people is not against this
> subject.
> Version: GnuPG v1.4.9 (MingW32)
> Comment: Using GnuPG with Mozilla -
> 3+uuhwvPkq3sVin+wraQbE/YUeDtEnZvbnPk0LDF+q0xLDn4i5GS/tVDxZBYWA5k
> W/He+xo79SC8tJYbBW1fSVYenhiE0Thq4b/wHzuCi/9sTQOeVfssCpK6uAp5hdRG
> fmJZcYhjkXjh1rQwdDrAmp2mCaNMc+4y3fKjfZEjcG5gWnvEF+4sX3nj/oL3GXx/
> 1FYLoa+HMvtkLb/ECk3EwxgNoQ/RPzloH6kXw8ZM+KuzQ16/VlDovYoBiGm9zC0=
> =xWM5
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