GPL question

[ca_tex-kernel]

Hopefully this is not going to start a huge thread war on open source
philosophy and such, but the company I work for has some proprietary code built
as a 2.4 linux kernel module for a product they sell.  They are concerned about
releasing the source code.  I noticed that what this code does and how it does
it seems pretty clean (at least GPL-wise), but it does modify sys_call_table to
add a system call which is then used to call the module from userland.  Can
they avoid releasing this code or is this crossing into a gray area?  I used to
think I more or less understood the basics of the GPL, but after talking to
their lawyers I am totally confused.  Thanks.


=====
Jarrett L. Redd (K9HMV)
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