[nebulous1]

I think you're slightly off there. The AGPL doesn't apply to software accessing the AGPL licenced software over a network, it applies to the AGPL software that's being accessed. As in it applies when the software is being accessed over the network rather than when it's being distributed (as with the GPL). This is actually mentioned in the article.

[vishvananda]

I think you have this correct, as I understand it. Just to explicitly state the differences:

1. You can modify GPL code as much as you want, and as long as you don't distribute the software, you do not need to make the modifications available. If you distribute the software, you are required to make your code available.

2. The AGPL extends the definition of distributing the software to making the software available over the network. This means if you modify AGPL software and then make it available over the network (as SaaS, for example), then you are required to make your code available.

[ninkendo]

> The AGPL extends the definition of distributing the software to making the software available over the network

Doesn't this apply transitively? That is, I made MongoDB available over the network to my web tier (thus creating a derived work), and made my web tier available over the network to your browser (thus distributing it), thus, haven't I transitively made a derived work from MongoDB available?

I ask because this exact scenario seems to be what makes the company I work for so scared of AGPL. It's not necessarily cut and dry, but it's a scary enough possibility that we just ban it outright.