When does a vendor need to provide sourcecode for products?

[Daniel Meyer]

Hi,

i was told of a possible GPL violation. There is a vendor selling software 
which turns your PC into a thin client. That software is, surprise 
surprise, linux based. The policy of the vendor seems to be: admit that 
its linux, dont bother about the GPL, and if some customer ask for the 
sources point them to www.kernel.org.

Well, this is a clear violation of the GPL i think. The problem is: The 
vendor does not have a download/trial version available on the website. So 
my question is: Does the vendor need to provide the source code for the 
GPL parts of the software to anyone or just to customers?

Danny
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