Question related derivative code based on our Apache licensed code

[Jürgen Schmidt]

Hi,

over the last days i was asking myself how it is exactly with code that 
is based on our Apache licensed code.

Well i have read the Apache license but the practical relevance is not 
clear for me.

In detail if a derivative project merge our now Apache licensed code 
with their code that was based on the former Oracle licensed LGPL code. 
This code becomes automatically Apache licensed, correct?
If yes, does it mean that we can use the changes on this code in our 
code as well if it is publicly available?

Ok the license say that it is possible to put an additional license on 
all changes made on the code when you mark all changes in an appropriate 
way. How is that possible or done in practize with many minor changes 
(e.g. improve the performance of an existing loop, or initialize 
existing variables etc.)? And which license is valid if a trivial change 
is made in our (the original) source in the same way, e.g. initialize a 
local variable to prevent a warning?

Anyway it seems that the new changed code becomes derivative work 
because the Apache license can't be removed.

I hope my question or thoughts are not too stupid and that somebody know 
the answer ;-)


Juergen


PS. we talk about thousands of files, many changes and a lot of stupid 
necessary work (marking all changes appropriately)