Heidelberg’s intellectual property is protected. Distributing a copyrighted for profit (e.g., selling copies on eBay) is illegal. However, downloading a single copy for your own maintenance and operation generally falls under "fair use" for existing equipment owners.
Heidelberg has digitized most legacy documentation. Go to the (you need a valid customer login with a service contract). Navigate to "Documentation" > "Speedmaster" > "SM 72." Here, you can download the official, searchable PDF. Cost: Free for contract holders. heidelberg sm 72 manual pdf