[DUG] Licencing schemes

[Matt Comb]

Thats totally cool...
> John
>
> I always liked the idea of a .lic file, your app attempts to 
> exclusivlely open a 1 byte block until it suceeds and keeps the block 
> locked whilst running, This way a 10 byte file would allow for 10 
> users, if the system crashes then the system is self-fixing, no messy 
> unlock procedures, also the name of the lic file can be a hash with 
> the size (stop some smartass hacking it with notepad)
>
> if no lic file is found demo mode is used, if it fails to open a block 
> in the lic file, 'out of users' error
>
> HTH
>
> N
>
> John Bird wrote:
>> I am putting some licencing code into some programs, common sort of 
>> scheme
>> where the program runs in a demo mode, but if has been registered 
>> switches
>> to full mode.
>>
>> My preference is for licencing information to be stored only in one 
>> central
>> shared file on a server, nothing in pc registrys, so that when a pc is
>> upgraded or replaced there is no reinstallation needed.
>>
>> I think I can do a simple and pretty foolproof scheme based on this
>>
>> What do others use?
>>
>> (I would only use another scheme if it was not using registry stuff as I
>> want centralised administration)
>>
>>
>> John
>>
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>>
>
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