Adobe use their to protect eBooks and PDFs along with (their free eBook and PDF reader) on the client side. This allows the distribution of PDFs with more flexible security options than the usual standalone PDF will allow. For example, documents can be time limited or allow only a certain number of pages to be printed.

This may well be a sledgehammer solution to your problem as I've no idea of Adobe's pricing for this product or whether is's practical for a small number of documents. It's used by the likes of the British Library (until recently anyway) for electronic inter-library loans which expire after 2 weeks and only allow the article to be printed once. At work, I've once bought a book that required this. Never got it to even show in Adobe's Digital Editions.

Your credit card's Da Vinci Code: How the 'Luhn formula' evaluates credit card numbers - Editorial Policy. In the unlikely event that you've given any thought at all to your credit card number, you probably view it as merely a series of random numerals: 16 digits. See also: How to recover deleted files.

That may very well have been due to the website that sold me the book, as that website somehow needs to signal Digital Editions about the digital rights (one needs to have Digital Editions installed prior to downloading the book). Or maybe even some restrictions on the company's computer was to blame. Still, I'm not buying anything that requires additional software anymore. – Sep 12 '09 at 8:07. If you can print once, you can print an infinite number of times. Consider a network printer: the raw data to be printed has to be sent to a remote embedded device, which your program would have no way of restricting, even if it somehow assumed ownership of the user's entire machine (which would already be considered extremly offensive; see the for the kind of reaction to expect).

How could you tell the device the user's machine is talking to is a real HP LaserJet, instead of something which pretends to be one (or, even simpler, pretends to be a remote spooler), but which saves the raw PCL/PS/whatever instead of printing it? Since that data is all that is needed to print the job, one would just have to replay it several times to a real printer to get several copies. School Timetable Generator Php.

Download Aplikasi Membuat Tema Hp Nokia. You could also use a sniffer (as @dlamblin mentioned) and save the trouble of emulating the printer. You could think of forbidding network printers, but having only network printers in an office (not simple printers attached to a general-purpose PC, but large printers plugged directly into the Ethernet switch) is not that uncommon.

Because of that, several of your users (how many would depend heavily on the target demographic) would not be able to print, which is not good PR. And even USB is not immune (though it would need more technical knowledge and perhaps special hardware); there exist USB sniffers.

And even without them, a usb printer 'gadget driver' on an embedded Linux device could be enough (note, however, that as of this writing I know of no usb printer gadget driver for Linux). This is all assuming the program has somehow managed to obtain complete control of the user's machine.

As the several failed attempts at copy protection show, this is easier said than done. Hp Usb Disk Storage Format Tool Free Download Cnet. How can you know that the printer driver you are using is just an uncommon version of the printer driver for a popular brand of printers, and not a hacked version to save the stream to the disk? How can you know there is no driver somewhere in the printing stack logging all the USB transactions to disk? And how can you differentiate a normal user of virtual machines from someone using them to intercept the communication with the USB devices?

All that said, you do not need to go that far. Most people, even if they have the technical know-how, will not attempt to bypass even the weakest attempts at preventing duplicate printing you make. In fact, I would not be surprised if most users would voluntarily not print more than once if told the file must be printed only once (but then there would be more cases of people accidentally printing twice). So, make a simple program which prints once and then erases the original data. Warn the user that the data will be erased after being printed once.