LGPL v2 section 6 loophole?

[Janez Pers]

Sitaram Chamarty wrote:
> OK, I'll rephrase my question: can the closed source app actively
> include measures to *prevent* something working which would otherwise
> have worked, and still be compliant with LGPL v2?

> [I should have clarified that I assume the API compatibiity still
> exists, i.e., I am asking about cases where *technically* it is
> possible.  

LGPL allows linking with closed-source programs. You cannot
know if author of the closed-source app prevented compatibility
a) on purpose with evil intentions, b) because he was lazy and
used API in a version dependent manner or c) because there
was good technical reason to do so.

You cannot know if the reason is a, b or c, and since it is
a closed source app, you don't have sources and nobody is
obliged to release them to you - so in any case, such requirement
(that authors don't prevent compatibility on purpose) would be
  unenforceable.

Janez.