I've released a new version of the plugins for Houdini 12.5. Here's the link:
http://www.3dde.com/plugins_page.html [3dde.com]
I've added support for GIF files and modified the watermark to randomized scanlines. It's not pretty and will flicker (the purpose of a watermark) but it's more discreet than the old one.
This is compiled with GCC-4.6.2 using Houdini12.5.376 so make sure you have the compatible version of Houdini and GCC installed.
Also the windows 7 version is on its way soon. I'll post it once ready.
Enjoy.
Cheers,
Ron