Those of you who had a hand in trusty scheme may find much of interest in this paper. The only major thing it appears to be missing is rights amplification:
ftp://publications.ai.mit.edu/ai-publications/1500-1999/AIM-1564.ps.Z
Jonathan S. Shapiro, Ph. D. IBM T.J. Watson Research Center Email: shapj@us.ibm.com Phone: +1 914 784 7085 (Tieline: 863) Fax: +1 914 784 7595