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[Richard Kenner]

> Modifying a program you have legitimately acquired is Fair Dealing.
> The Law of the Land gives you the right to do that, even if the
> vendor restricts your exercise of that right in practice by
> withholding the Source Code.

That is false.  Modifying a program is "creating a derivative work".
As purchaser of a copyrighted item, you normally *do not* have that right.

And this certainly may vary from jurisdiction to jurisdiction.  For a
(quite dated at this point) discussion of this issue from a US perspective,
see

http://www.law.berkeley.edu/php-programs/faculty/facultyPubsPDF.php?facID=346&pubID=157

The author is a recognized expert in software IP law.