license key validation - encryption/decryption

[Markus Schaber]

Hi,

On Mon, 3 Dec 2001 21:25:16 -0800 (PST)
Rock VZ <rockvz at yahoo.com> wrote:

> How do i generate this "encrypted license key" for
> different features for different customers?
> 
> How do i validate it at the customer site that the
> "key" installed is valid?

Independently of the language and the file format, you should read a good book about cryptography. 

"Bruce Schneier: Applied Cryptography" is known to be one of the best books about this subject.

markus
-- 
"GPL software is not free - the cost is cooperation"