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I am creating a web application. I would like to create a product key for
the app that expires after a full year of usage. Any suggestions?

Thanks,
Mark

Have the year from today date go through some algorithm (that can be
reversed) that will append the date to the product key.
10/26/2005 -> algorithm -> A#$DVDGF

Program reads
A#$DVDGF -> reverse algorithm -> 10/26/2005

"SouthSpawn" <> wrote in message
news: lkaboutsoftware.com...
> I am creating a web application. I would like to create a product key for
> the app that expires after a full year of usage. Any suggestions?
>
> Thanks,
> Mark
>

I kind of want to stay away from algorithms, because they can get cracked.
That's why so many software packages these days are being cracked, because
someone figures out the algorithm.

Mark

Nope .. the idea is - make your algorithm public and keep the key secret.
The more people look at the algorithm, the more bullet proof it will be.

- Sahil Malik
http://dotnetjunkies.com/weblog/sahilmalik
Please reply to the newsgroups instead of email so everyone can benefit from
your reply.


"SouthSpawn" <> wrote in message
news: lkaboutsoftware.com...
> I kind of want to stay away from algorithms, because they can get cracked.
> That's why so many software packages these days are being cracked, because
> someone figures out the algorithm.
>
> Mark
>