On 5/12/2014 7:28 AM, Barry Rowlingson wrote:
On Mon, May 12, 2014 at 1:11 PM, Ashis Deb <ashisde...@gmail.com> wrote:
Well it's the company requirement to do so , and give it on a trial
basis to client to check , if they like they will BUY or it will self
destruct itself ,
No, if they like it they will BUY or they will CIRCUMVENT your
self-destruction mechanism.
The company requirement has not been thought through to
practicalities, and is unrealistic, and is not constrained by
limitation. How do you prevent them re-installing?
For a price, I will fly (first class) to all your clients after 30
days and delete the software for you.
Linux is free, open source software (FOSS), but people create
lots of commercial software to run on Linux.
One company I know installed an S-Plus or R package only on
servers, so their customers had to use it on a server. (In this case,
the customers had a GUI and may not have known that it was S-Plus or R
behind it.) This company also developed techniques for encrypting their
code. I don't think it was perfect, and they eventually wrote it in C
or C++ or Matlab.
So part of the answer is you can write part of your package in a
compiled language. That part can check your web site to check the date
and other things.
If you submit anything to CRAN, you must enter a legally binding
agreement that anything you submit is released under an acceptable FOSS
license. I don't know what they do if they find an unacceptable license
in a CRAN package, but at minimum, the package will be removed.
Spencer
Barry
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