My advice is
don't google for mobidedrm or kindlepid and don't search torrent sites. That kind of software may be illegal depending on your countries laws and possible applications of the software.
In the U.S. its use might be restricted (or denied) under the Digital Millennium Copyrights Act.
http://en.wikipedia.org/wiki/DMCA
Also note that if you claim "Fair Use" the burden of proof lies on the defendant.
http://en.wikipedia.org/wiki/Fair_use