Drools Guvnor Documentation for PDF points to:

http://docs.jboss.org/drools/release/5.5.0.Final/drools-guvnor-docs/pdf/drools-guvnor-docs.pdf

where it SHOULD point to:

http://docs.jboss.org/drools/release/5.5.0.Final/drools-guvnor-docs/pdf/guvnor-docs.pdf

(or change the target file name)

Same is true for some of the previous versions. (5.5.0.CR1, 5.4.0, etc)

Evelthon