You have spent quite some time and labor in gathering material for your book. It had cost you a good sum, but it was worthwhile. Just procuring the rights for publishing some rare images had set you back by a few thousand Dollars. However that does not make any difference. Going by the pre-release reviews you are assured that the book will sell more than 10,000 copies in its initial print order.
After keeping aside the commission to be paid to the publisher, you will still have more than sufficient amount of money with you. Even after compensating the costs incurred in procuring the images. You are making a big mistake by not applying copy protection routines in the pdf file. Most magazines are sold via the net and hence they are published in the pdf format.
While this ensures easy distribution through the internet, it also gives hackers and pirates an opportunity to earn money from your book, money that was legally yours. Most of these hackers keep on scouring the net for new releases and they keep an eye out for costly books. Once they find where these books are hosted, they try to hack the server and download a legal copy of that book.
They then pass this on to the pirates who make multiple copies of the pdf book and upload them to various sites from where it can be downloaded by people from all over the world. The entire procedure, from the time the hacker obtains a legal copy to the time the illegal copies are uploaded to the web and its presence announced, takes less than an hour.
If the server hosting the book cannot be hacked, the pirates purchase a copy of the book through legal channels and then proceed to post pirated copies of the same. If the book you published is value and if you had not taken care to copy protect the same, you can be rest assured that 80% of its copies that are being downloaded from the net, are fakes.
This puts a huge dent in your plans. You were planning to get back the money paid for the images within a week, but the way things are moving, you might never be able to recover the publishing costs.
Using a decent copy protection software ensures that the pirates cannot tamper and copy your book. Those who need the book will have to download the same from legal sites after having paid the price for the same. Block pirates from hijacking your book and ensure that the only way anyone can obtain them is by paying for it.
Using PDF document security software ensures document security. You can rest in peace knowing that your magazine has got copy protection software.