>I writted a course and ship it compiled in VFP 6.0
> using getvolume to prevent the client from copy
> my course to a another.
>
>
> A problem happened:
>
> Everytime my client formated his HD, he had to
> call me to ask for a new password.
>
>
> Then I aquired a program named hypermart HTML
> The owner of hypermart says that the serial number
> of HD does not changed even if HD is formated
> so client will have no problem when format HD
> because his password will be the same
>
> Please take a look below to see if
> I misunderstood what he says
> because as far as I've learned, serial really changes
>
>
>http://acrisoft.com/serial.jpg
>
>
> He says serial does not change
> Is he wrong ?
>
> thanks
>
> Moisés

Moises,
What he says is true. I think you misinterpret the serial number. One serial number (as often referred when HD serial number is asked) is the one that's assigned with format (since DOS4). This changes with every format or even with a small assembly routine since it's a value written in boot sector.
The other one is manufacturer's code that's burried in firmware. It's same for a series of production (not unique per disk - ie: if your customers all have the same brand, by coincidence same model they have a high chance to have the same serial numbered HDDs).
As a summary neither one is good for protection.
Cetin