The following is a copied email I previously sent to Tom Szilagyi....
On Sun, Aug 2, 2009 at 11:13 PM, Michael Fisher<mfisher31(a)gmail.com> wrote:
  Hi Tom!
 I just recently purchased a software item called 'The Beat Thang'  .
 You can
 find it at 
www.beatkangz.com.  I am running MacOSX Leopard.  After
 installing their software and low and behold in my
 '/Library/Audio/Plug-Ins/' folder appeared a subfolder named 'LADSPA' .
 hmmmm... I should probably tell you that I mostly use linux for audio
 recording so I am familiar with ladspa, especially your plugins (very
 nice).
  Anyway.  These guys are distributing binaries of the following ladspa
 plugins:
   * tap_chorusflanger
   * tap_echo
   * tap_echo
   * tap_pitch
   * tap_reflector
   * tap_vibrato
 There are other ladspa plugins too.  See attached screenshot.  They
 are not
 giving credit, providing source, anything really required of them from
 the
 GPL as far as I can tell.  I thought you might want to know about
 this.  It
 really bothers me though because I personally stand for the GPL and think
 that folks who use GPL'd software should abide by the rules.
 I'm pretty sure their installer is responsible for 'installing' the
 plugins
 because I can erase the LADSPA folder, then reinstall the Virtual Beat
 Thang
 and magically the LADSPA folder reappears.
 There is no mention for credit to you guys (Linux Audio Developers) on
 the
 Beat Kangz website either.
 Also, when I run their program from the terminal it outputs to stdout
 that
 indeed these ladspa plugins are being loaded.  It kind of makes me wonder
 what other open source software they are using and perhaps linking
 statically to libraries and what not.
 -Mike 
Tom Szilagyi wrote:
  Thanks for reporting this.
 I notice in the screenshot that there are other LADSPA plugins there
 (vinyl by Steve Harris; the CMT plugins; AFAIK all others are also
 GPL'd LADSPA).
 I would ask you to write a similar mail to the LAD mailing list with
 some more provocative subject ("GPL violation alert" or something like
 that) so everyone knows about this. Then together we can write a
 letter to Beat Kang asking that they abide by the GPL, or remove GPL
 from their stuff.
 Lets be clear: other than publicity, we don't really have a weapon
 against them. Legal action is probably out of scope for us, so in case
 they don't follow what we ask for (which is likely since I'm sure they
 knowingly violated the GPL in the first place) humiliating them as
 publicly as we can may be the best we can do.
 FSF or EFF may be able to help us with this (I'm sure there is at
 least one organisation dedicated to protecting the GPL, but I'm not
 sure).
 Tom 
No problem.  It's not really fair to put a 'skin' around free
software,
call it your own, and then sell it.  The only thing I ask is that my
name be left out of the letter that may be written to them.  The reason
is, that I personally know one of the staff members at the Beat Kangz. I
just would hate to have it cause any trouble.  My friend personally
doesn't have anything to do with this violation, he just works for
them.  I hope that isn't a problem with you.
-Mike