Amyuni Technologies is what I would suggest to anyone looking for a PDF solution that offers high-performance tools for both software developers and the common user, but that is relatively more affordable than, say, Adobe. If you're at all interested, check out the site:http://www.amyuni.com
Not all PDFs are created equal. As you probably already figured out there isn't a practical way to secure a PDF unless you use something like Activ along with HYPrLock. Please note that some systems claim to secure the PDF, but neglect to mention that the PDF has an .exe wrapper and is opened without any security. HYPrLock allows you to use password protected PDFs and hides those passwords from the end user, which means that it is extremely difficult to crack.
It might not be important to you, but often creating PDFs without an Adobe product means that 1) The user will not be able to use the commenting feature. True, most users aren't currently away that the free Reader version offers this ability but as word spreads they will likely want it. Think of commenting as writing notes to yourself in a book's margin. 2) You will be unable to include Flash as well as other multi-media files.
Adobe's Acrobat Pro is expensive, which is why I suggest that users take advantage of Adobe's online PDF conversion service. The first 5 conversions are free. After that it is $10 USD a month. BTW Adobe will also stores the file for you so you can send links for file download.
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