LSI is Lightning Source and they are a mostly Print On Demand printing company in Tennessee. To print books through LSI you need to call yourself a publisher and have ISBNs. LSI is actually the printer that many vanity and commercial publishers use to print short run POD books, i.e. Lulu, iUniverse. They are not a publishing company. When a book is printed with LSI it can be, if the publisher wishes, be placed into the distribution chain, i.e. online book stores.