Question on GPL compliance

[Daniel Carrera <daniel.carrera@zmsl.com>]

Hi all,

I'm looking for ways to comply with the GPL without the 3-year 
requirement (I don't know where I'll be in 3 years).

Suppose I have an online store that sells CDs of GPL software. People 
buy the CD and we ship it to them. One obvious way to comply with the 
GPL is to always send a second CD with the sources.

Now, here's another idea. Suppose that when the user clicks "buy" they 
get a message: "would you like the sources CD? (extra $2)". If they 
click yes we package it too. If they click no we don't, and never again 
have to worry about the sources because we did give them a chance. And 
because the offer was for a CD, it is an "equivalent medium".

In your non-lawyer opinion, is this an appropriate use of the GPL?

Cheers,
Daniel.
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