Quote:
Originally Posted by user_none
Both of those types do not require an authentication server but I still don't know of a company that sells DRM that is not intended for use as part of a larger store. Can you name a company selling either type to individual authors for them to sell themselves and not through a store front? Due to the popularity of people asking about this I'm still surprised there aren't any well known products for do it yourself DRM.
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If this author is savvy enough to write a book about SQL, (s)he should also be capable of creating their own watermarking scripts on the website for each copy downloaded.
ePub is merely a zipped collection of html files. They could easily write something that would insert a comment into each HTML file with the purchaser's information, or in the zip file comments field, or even somewhere on the title page. If they wanted to be more secret about it they could generate a hash for each buyer and insert that somewhere (somewhere that would survive any Calibre conversion) so that they could identify which buyer was distributing the work. This script could then generate the .epub (.zip) file on the fly just before offering it for download.