Document protection

[Woody44]

I am working on a project that will result in a book of prints of computer (CADD) drawings. The original drawings are on several different size sheets (pages); the book will be formatted for pages in the U.S. ledger size (11" x 17", or 279mm x 432mm).

The print-on-demand publishing services such as Amazon KDP and Ingram-Spark don't offer pages that large. I can find custom printers who will produce the book, but they are printers -- they would print a batch of books and ship them to me in a box. I would prefer not to be involved in storing, packing, and shipping books on a one-at-a-time basis.

An alternative would be to offer the book in the form of a PDF, but I'm concerned that it would be too easy for a person to buy one copy and then give copies to all their friends. I know that FlexiPDF allows setting a password to provide protection against unauthorized editing or printing, but is there any way to limit or prevent unauthorized redistribution of the file itself?