Paul Claude wrote:
Thanks Mark.
reply 1) Yes, you can broadcast a UDP request and make all copies on
the network send (part of) their serial number to compare them with
the serial number of the newly opened copy of your application.
Did you know if exists some example stack around, to perform and answer to
an UDP request?
There is a sample UDP client and server in revonline under username
alextweedly - it's just a very simple echo server and echo client, but
should be a start for you.
Beware the problem of Firewalls - the Win XP firewall on each Windows
machine may drop all incoming UDP packets by default (I'm not sure, and
not quite willing to risk setting my own "firewall settings" back to the
default to see what it does :-) , so it's quite possible and/or quite
easy for users to prevent different instances of your app from seeing
each other with this scheme.
reply 2) Yes, you can use USER$ on some platforms, but not all. You
can also use MAC address, label of the hard disk, IP address and
other characteristics. However, I will never buy software that
requires me to provide information like this, because I know it will
be a hassle to install the software on a new machine. Besides, there
is a hack for each protection measure which makes it difficult to
decide how much to invest in protection.
I thought that $USER should be valid because: 1) a license is valid, in
effect, only for one user (think about a corporate with hundred of stations
that buy a copy of your app). 2) For a single user with 2 computers, in most
of the cases he will have the same account user name on both,
I wish I were that organized :-).
I think I have at least 5 different user names on the computers in my house.
--
Alex Tweedly http://www.tweedly.net
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