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RE: [Help-gsl] Permissions for using GSL in my own software

From: Earl, Joseph
Subject: RE: [Help-gsl] Permissions for using GSL in my own software
Date: Thu, 28 Jan 2010 00:08:18 +0000

Yes, under the GPL once they have the source they must be able to redistribute 
it as they see fit so they may charge people for it or give it away for free.
However they must distinguish it from your version (you may trademark the 
product name for instance as Mozilla do) and provide proper attribution - i.e. 
they must indicate their application is based on your source code.

My main question is whether you are allowed to charge $X before the user may 
access the source code.

Joseph Earl

From: Carl Boettiger [mailto:address@hidden
Sent: 28 January 2010 00:03
To: Earl, Joseph
Cc: address@hidden
Subject: Re: [Help-gsl] Permissions for using GSL in my own software

On Wed, Jan 27, 2010 at 3:45 PM, Earl, Joseph 
<address@hidden<mailto:address@hidden>> wrote:
I have a question on GSL GPL, in the FAQ it states:

1) Does the GPL allow me to charge a fee for downloading the program from my 

   Yes. You can charge any fee you wish for distributing a copy of the program. 
If you distribute binaries by download, you must provide "equivalent access" to 
download the source-therefore, the fee to download source may not be greater 
than the fee to download the binary.

2) Does the GPL allow me to sell copies of the program for money?

   Yes, the GPL allows everyone to do this. The right to sell copies is part of 
the definition of free software. Except in one special situation, there is no 
limit on what price you can charge. (The one exception is the required written 
offer to provide source code that must accompany binary-only release.)

So the following should be allowed?

- Charge $X for an application binary and required written offer to provide the 
source code for free
- and charge anything up to $X for the source code only (for people who do not 
purchase the binary)

And would it then be allowed for someone to pay $X for the source, and then put 
it up on their own website and distribute it for free (with attribution, and 
under GPL, etc) ?

Joseph Earl

-----Original Message-----
 On Behalf Of Brian Gough
Sent: 22 January 2010 15:30
To: Vicent
Cc: address@hidden<mailto:address@hidden>
Subject: Re: [Help-gsl] Permissions for using GSL in my own software

At Sat, 16 Jan 2010 14:26:03 +0100,
Vicent wrote:
> But if I develop a software of my own and I register or patent it, am I
> allowed to use GSL inside it???
> Sorry if this is a too easy question. Anyway, I would appreciate any
> feedback.

Information about the license:

See also the brief description at
under "Licensing"

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Carl Boettiger
Population Biology, UC Davis

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