By this, I want to know what parts of the hirens boot CD I cannot use to repair other peoples computers for a profit, without purchasing a separate license.

Hiren's CD has a lot of apps most of which are either GNU or written by the community. There are some commercial apps but someone here notes that it's trial version (see comments): 9Down.COM - Download Hiren's BootCD 9.2 (http://www.9down.com/Hiren-s-BootCD-9-2-14520/)