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How to Create and Remove Password for...
For many reasons you may want to password protect your PDF files. For example, you may want to share a file containing confidential information with your friends. The safest way to share the file, besides mailing a hard copy, is to create a password that you must know in order to access the file. Adding a password to a PDF file is simp [...]
How to Read PDF Files on iPhone, iPod...
Generally, you can’t read PDF files on iPhone, iPad or iPod directly for the format isn’t supported by the devices unless you use third party application to help you. However, if you have iBooks installed in your IOS devices, no other applications needed, just follow the tutorial below, it tells you how to read PDF files on iPhone, iPod and i [...]
What is the Specialized subsets of PD...
Specialized subsets of PDF
The following specialized subsets of PDF specification has been standardized as ISO standards (or are in standardization process):[1][18][19][20]
PDF/X (since 2001 – series of ISO 15929 and ISO 15930 standards) – a.k.a. “PDF for Exchange” – for the Graphic technology – Prepress d [...]
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