[Openroad-users] Coding app to work for designated period

[Darren Mason]

Hi Gareth

 

We 'encrypt' a license string that has an expiration date built into it.  We
actually have a number of different structures and use an identifier in the
string to denote which technique has been applied in the string, so we check
a nominated character as the first step and this tells us how to unpack the
string to derive the date.

 

The expiration date is embedded in the string and extracted using the
required technique.

 

So a license string may be 2398762567.

 

The 1st 3 characters may be nonsense and do nothing, the 4th identify the
'unpacking' technique, and the next 6 contain a number that can be unpacked
to represent a date.    The 4th character in the license string above = '8'
so we use the technique associated with 8.  This may be something like the
number of days since 1990, so when added to 1990 it gives the expiration
date.   You can do some stuff such as counting the number of days, dividing
it by 3, multiplying it by 7 , and then adding 1234 to it.    We use a
separate program to generate the license string for our clients (we enter
the expiration date and the 'packing' technique and the software generates
the string).  Our program checks the license string and unpacks it.  If we
are nearing the expiration date it warns the users and once expired it
denies them access.

 

We don't do the above but I am sure you get the idea.  We have a number of
different techniques so different clients don't necessarily have the same
technique applied.

 

Anyway, it may be overkill for you but it works really well for us.

 

 

Regards

 

Darren Mason

 

cid:image001.jpg at 01C75FC8.883E9850

 

MyWorkplace Solutions Pty Limited

Level 5, 11 Queens Road

Melbourne Victoria 3004

 

Ph.   1300 733 731

Mob. 0419 337 170

Fax.  03 9710 1112

Making Service our Priority

 

www.MyWorkplace.com.au

 

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From: openroad-users-bounces at peerlessit.com
[mailto:openroad-users-bounces at peerlessit.com] On Behalf Of
gareth.2.edwards at bt.com
Sent: Thursday, 2 August 2007 8:46 PM
To: openroad-users at peerlessit.com
Subject: [Openroad-users] Coding app to work for designated period

 

WinXP

OR2006

Ing2006

 

Hi All,

 

I've never really given this much thought in the past,.

 

What ideas do you have for making an application only work for a given time,
like licensing? Because dates can be changed and data accessed in the DB
(ie. days_remaining = 20).

Cheers, 
Gareth Edwards 

BT Global Services 
tel: +44 (0)131 345 4671 
email:  <mailto:daryn.piper at bt.com> gareth.2.edwards at bt.com

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