I'm not sure about Belgian law on the subject, but I'm pretty sure that unauthorized reproducing can get you fined somehow...
I would also like to point out that most of the Perl books from ORA (can't tell from other ones), don't include a statement indicating that reproduction without prior consent etc is illegal (and immoral).
The dutch version of the Perl Pocket Reference apparently does have such a statement, but I'm sure Academic Services in somehow involved in that.

Note to people at O'Reilly: is it me or do most Perl books mention Java and The Nutshell series, even though they're not part of any of those two groups.

Greetz
Beatnik
... Quidquid perl dictum sit, altum viditur.