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The PDF format is now the standard for publishing and print-based industries. As you would expect, numerous free and inexpensive PDF readers are available, but relatively few inexpensive PDF creator apps exist. Word-processing programs such as Microsoft Word and OpenOffice Writer have features that let users create PDF documents with a Save As option. Even some Web-based solutions make opening and creating PDF files a bit less costly for non-business users. With all of these products, what shows on the screen or printed page is exactly what the file's author intended.
I need your help if you can, i have read your article and purchase the software. But I can't figure out how to add expiry date for the document. So if you can help me out that will be much helpful.
Will look forward to hear soon from you.