Rowan Collins wrote:
have an effect - IANAL, but this is my understanding: if your site is publically accessible, the exact nature of your changes to the core software must also be made public, since the GPL forbids you to have users who cannot build further on your changes.
It is my impression that this is not true.
It's perfectly o.k. under the GPL to use modified GPL code on a website without disclosing your modifications.
http://slashdot.org/askslashdot/00/07/13/1831245.shtml
Is a sort of old slashdot article about it.