Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have noticed that although there are many professional (e.g. O'Reilly) books available as PDF, that many textbook publishers choose not to make PDF format available for purchase. What are the reasons behind this. e.g. is it because the PDF format does not offer strong enough copy(right) protection?

share|improve this question

closed as off topic by Journeyman Geek, random Nov 13 '12 at 5:53

Questions on Super User are expected to relate to computer software or computer hardware within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

up vote 4 down vote accepted

Technically, copyright protection is the same for a hard copy book as it is for a book in PDF format. "Copy Protection" is another matter. It's easy for one person to buy a book in PDF format and make a copy of it for 10 classmates. Each of the copied PDF books would be indistinguishable from the original purchased PDF.

PDF files do not have a "permanent" way to identify the "Owner/Purchaser". They would need to be registered, and encrypted and password protected so if the identifying information is modified, the book would not be readable. This sort of information can be embedded into the PDF file but, PDF's can be "deconstructed", and then "re-constructed" with new or false identification information.

At some point in the future, you might see textbooks in electronic form, but they would be a different (not PDF) format.

Either way, that means creating a "custom" PDF (or other) file for each purchaser at the time of sale.

For a printed book, it is much harder. Not many students would want to show up to class with a textbook in photocopied form.

Also, it's about the money.

These days, textbooks can run from $75 to $100 and more. The publishers would have a hard time justifying charging that much for a PDF version.

A non-textbook printed book, say a novel, or a cookbook, only has to be written once. Then it can be printed and reprinted many times and can be sold for decades or longer with little editing or revision.

Textbooks are different. It costs publishers a lot of money to research and pay writers to create textbooks, which quickly become obsolete. A textbook continues to be used and purchased new from publishers for a relatively short period of time. Probably an average of about 5 years max. Depending on the topic, some may last 10 years but that would be rare. Some are obsolete in 2 to 3 years, and some probably quicker than that.

Plus, schools probably don't like the PDF's because they wouldn't be able to profit near as much from book sales, and from used book sales.

share|improve this answer
Thanks for the thorough answer, even though apparently this is an unpopular question here. – T. Webster Nov 13 '12 at 7:00
It's funny that a question about the topic of PDF files is not "computerish" enough for some. Perhaps you should have mentioned that the textbooks were for a computer hardware or software class =) – Kevin Fegan Nov 13 '12 at 9:47
if I knew how to migrate topic, I'd send this to – T. Webster Nov 14 '12 at 2:35
@T.Webster I'm not sure how to do it either, I don't think I have enough rep points yet. If you want it moved you could ask a moderator to do it. Find the row of links (share|edit|delete|flag) that is at the bottom of your question. Click "Flag". A small box will open. Choose "Other" and it should be something like "Inform Moderator". Type a message to a moderator telling them you want to move the question and where you want it moved to, then submit the message. IT could be a few days before you hear or see anything. – Kevin Fegan Nov 15 '12 at 4:18
done, we'll see if anything happens – T. Webster Nov 15 '12 at 8:09

Not the answer you're looking for? Browse other questions tagged .