Internal Program Version: WebP  0.1.3

This package included also libwebp.so.0

WebP is an image format that does lossy compression of digital
photographic images. WebP consists of a codec based on VP8,
that Google open-sourced in May 2010 and a container based
on RIFF. Webmasters, web developers and browser developers
can use WebP to compress, archive and distribute digital
images more efficiently.

http://code.google.com/p/webp/