PDF is a file format for the long-term archiving of electronic documents. Portable Document Format (PDF) is a file format created by Adobe Systems. PDF is used for representing two-dimensional documents in a manner independent of the application software, hardware, and operating system. Each PDF file encapsulates a complete description of a fixed-layout 2D document that includes the text, fonts, images, and 2D vector graphics which compose the documents.
A PDF file may be encrypted for security, or digitally signed for authentication. The standard security provided by PDF consists of two different passwords, “user password” and “owner password”.

A PDF document may be protected by password to open (‘user’ password) and the document may also specify operations that should be restricted even when the document is decrypted: printing; copying text and graphics out of the document; modifying the document; and adding or modifying text notes and form fields (using ‘owner’ password).
However, all operations (except the document open password protection, if applicable) which are restricted by “owner” or “user” passwords are trivially circumvented by many commonly available “PDF cracking” software and even freely online, and thus these restrictions are obviously ineffective in letting the author control what can and cannot be done with the pdf file he or she created, once it is distributed. This warning is also displayed when applying such restrictions using Adobe Acrobat software to create or edit PDF files.

Even without removing the password, most freeware or open source PDF readers will ignore the digital rights management “protections” and will allow the user to print or make copy of excerpts of the text as if the document were not limited with such anti-features.The big advantage that PDF documents have over image files like TIFFs or JPGs, is the ability to secure the document. You can secure PDF documents by password protecting the PDF files or documents. You can also limit a user’s ability to copy text from a PDF document and even prevent a user from printing the PDF document.PDF Protect-Unprotect Tool is a similar kind of software tools which helps users to implement various protections on their PDF files.

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