[p0llard]

> PostGIS via TCP

From a legal perspective I'm unaware of any ruling which establishes a difference between components communicating via TCP and components communicating through function calls at the ABI level (e.g. linked libraries); the latter is apparently enough to constitute a derivative work (see the LGPL/Linking Exception). There are obvious technical differences, but it's not clear that they should be treated any differently from a legal perspective.

[dathinab]

The LGPL linking exception mainly exist because static linking does modify the included binary in the way it links. At least with LTO enabled.