RE: [rtl] license issue:

["Dresner, Norman A." <norman_a_dresner@md.northgrum.com>]

Based on a layman's reading of the LGPL, it's required to release source
code for any LGPL-software that you modify; you can simply provide URL's
pointing to the source of unmodified LGPL-code.  It is not required that you
release source code for any of your own programs that are distributed in
binary form.  

If the (L)GPL code you incorporate is linked into the binary, then the
preceding paragraph applies separately to the linked-libraries and your own
code.

AFAICT, there is no requirement in the (L)GPL that you release any "trade
secrets" as long as they are based on your own work, not modifications of
(L)GPL code.

	Norm Dresner
	Systems Engineer
	Radar Systems Engineering Department
	Electronic Systems and Sensors Segment
	Northrop Grumman Corporation
	MS 520
	Box 746
	Baltimore MD 21203

Voice:	(410) 993 - 2096	Mornings; all-day voice-mail
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> -----Original Message-----
> From:	yodaiken@fsmlabs.com [SMTP:yodaiken@fsmlabs.com]
> Sent:	Thursday, March 09, 2000 6:39 PM
> To:	ahgu
> Cc:	rtl@rtlinux.org
> Subject:	Re: [rtl] license issue:
> 
> On Wed, Mar 08, 2000 at 04:18:43PM -0500, ahgu wrote:
> > We plan to use rtlinux and gtk-- for the GUI.
> > There is GNU LPGL attached to both. Does that mean I have to release the
> > source code and make sure I don't charge anything for the software I
> > devolope?
> 
> You have to release source code unless you only make changes in the form
> of loadable kernel modules you write yourself and that do not contain
> any GPL code. You can charge whatever you want, but you must release
> GPL'd code for media costs. 
> 
> > 
> > Thanks
> > Andrew
> > 
> > 
> > ----- Original Message -----
> > From: Phil Wilshire <philwil@on-ramp.ior.com>
> > To: Thomas Eschenbacher <Thomas.Eschenbacher@gmx.de>; RTL Group <>
> > Sent: Wednesday, March 08, 2000 1:34 PM
> > Subject: Re: [rtl] accessing device driver from user space
> > 
> > 
> > > Thomas Eschenbacher wrote:
> > > >
> > > > Hallo,
> > > >
> > > > is there any simple way to access an RT device driver from user
> space?
> > > >
> > > > My problem is that we have a C library that has to access a serial
> ports
> > > > /dev/ttyS0 through the "rt_com" driver.
> > > >
> > > > I use rtlinux-2.2, kernel-2.2.14/i386 and the rt_com-0.4. The
> kernel,
> > > > modules and examples work fine, even the examples in rt_com do work
> > > > (open the port, send bytes etc.). The device driver uses
> char-major-60
> > > > and the serial driver of the linux kernel is removed.
> > > > I did "rm /dev/ttyS0" and "mknod /dev/ttyS0 c 60 0".
> > > >
> > > > The example modules are able to call open("/dev/ttyS0", O_RDWR),
> > > > but if I copy this line to a sample program I always get -1 as
> return
> > > > value?
> > > >
> > > > can anybody explain me why???
> > > >
> > > > thanks,
> > > >    Thomas.
> > > > --
> > > >
> > > Do a ls -l /dev/ttyS0
> > >
> > > The permissions may be set so that only root can open for read / write
> > >
> > > Regards
> > >    phil Wilshire
> > > -- [rtl] ---
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> > >
> > 
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> 
> -- 
> ---------------------------------------------------------
> Victor Yodaiken 
> FSMLabs:  www.fsmlabs.com  www.rtlinux.com
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