But the LGPL requires you that you can (principally) exchange the LGPL shared libraries by your own ones. (source: http://en.wikipedia.org/wiki/GNU_Lesser_General_Public_Licen...: 'Essentially, if it is a "work that uses the library", then it must be possible for the software to be linked with a newer version of the LGPL-covered program. The most commonly used method for doing so is to use "a suitable shared library mechanism for linking". Alternatively, a statically linked library is allowed if either source code or linkable object files are provided.'). Is this possible on iOS?
So, in practice, the LGPL doesn't actually let you change the code out, because the bootloader is allowed to make it impossible to modify the binaries, this being the reason for GPL3. On a jailbroken iOS device, though: yes, you can swap out WebCore if you manage to compile it (good luck ;P).
