[Gvsig_english] Data Encryption - gvSIG Mobile

[Chris Puttick]

No, the GPL would not force you to provide the source if the modifications are made for internal purposes only. The GPL only requires modified source distribution if you distribute the modified binary.

OTOH, having the source to a secure encryption system does not mean you can decrypt data made with the system any easier than if you didn't have the source.

And finally... If you distribute data in any form that is made accessible to some people, expect that it will eventually be accessible by many people. Protecting, securely, ownership of data is not something anyone is having a lot of luck with at the moment. Licence it appropriately and have lawyers standing by if you uncover others making profits with your data in breach of licence.

Chris

----- Original Message -----
> Re: [Gvsig_english] Data Encryption - gvSIG Mobile
> 
> Hello, Ali.
> 
> I guess that only makes sense if gvSIG Mobile itself decrypts the data
> just before using it, no? Since gvSIG Mobile is GPL software, you
> would be forced to provide the source code of a customized version of
> gvSIG Mobile that would do that. Therefore, anyone with some
> programming skills could easily decrypt the data.
> 
> Maybe using some copy-protection technique (
> http://en.wikipedia.org/wiki/Copy_protection ) along with an invented
> data format (for example, the SHP format with a particular value in
> the header)
> 
> In the MemoryShpDriver class, there is a byte array where the SHP file
> is loaded 'as is', so encryption/decryption methods should be applied
> to it.
> 
> 
> Regards,
> Juan Lucas Domínguez Rubio
> ---
> 
> Prodevelop SL, Valencia (España)
> 
> Tlf.: 96.351.06.12 -- Fax: 96.351.09.68
> http://www.prodevelop.es
> ---
> 
> 
> De: gvsig_internacional-bounces at listserv.gva.es en nombre de alitaha
> Enviado el: jue 02/12/2010 21:50
> Para: gvsig_internacional at listserv.gva.es
> Asunto: Re: [Gvsig_english] Data Encryption - gvSIG Mobile
> 
> 
> 
> 
> 
> Hi Juan and Simon,
> 
> Thanks for the replies, actually i miss-used the correct wording, it
> is not
> confidentiality issue but I want to protect the ownership of the data.
> 
> I need to protect the layers from being copied and distributed by un
> authorized person to be opened on aother pocket PC or desktop or
> another GIS
> tool. I want to use gvSIG mobile to open these layers using something
> like a
> license code, then if the data is coped, it cannot be used.
> 
> Thanks
> 
> -- View this message in context:
> http://osgeo-org.1803224.n2.nabble.com/Data-Encryption-gvSIG-Mobile-tp5793646p5797598.html
> Sent from the gvSIG international mailing list archive at Nabble.com.
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