[Lazarus] Ide add-ons licensing issue

[Giuliano Colla]

It's my company policy to provide our customers the source code of the 
applications, with a licensing condition which specify that the source 
code is provided only for customer convenience and reference.

In some special cases, the customer can make small himself 
modifications, with our authorization, and the license is modified 
accordingly.
In those cases the customer is also informed of the Lazarus and fpc 
version used for the original compilation, to avoid any compatibility 
problem.

It's clear to me that our source code carries our license, while Lazarus 
and fpc come with GPL license.

But what if we have some packages, which are not only run-time, but also 
design-time, and which we must deploy in order to make our customer able 
to recompile the program?

They're not of general interest, so it doesn't make sense to contribute 
them to the Lazarus community (with one of them I tried, but it was 
rejected, as too specific). They're just in our hands, and they must be 
added to Lazarus IDE just for our applications.

Common sense tells me that they should GPL'd too, but I'd like to be 
comforted by a knowledgeable opinion.

Thanks,

Giuliano