FhG Project description with links:
http://www.isi.fhg.de/ti/Projektbeschreibungen/softwarepatents.htm
It also links to a second part of the descibed study, which does not have the patent layer part:
22.09.2003
Patentability of software innovations
Case studies substantiate the results of the study commissioned by the Federal Ministry of Economics and Labour (BMWA) in 2001 on the implications for German software companies' innovation mentality and competition strategies
http://www.bmwa.bund.de/Navigation/Service/english,did=24958.html
From the first study, there is also a book available:
