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We need to send our customer a secured PDF's which he'll not be able to edit at all.<br />
I came across <a href="http://www.wikihow.com/Unsecure-a-Secure-PDF-File" rel="ugc">this article</a> which shows how to crack those so-called protected files.<br />
<br />
Please advice on how to really secure those documents.<br />
<br />
Thanks in advance
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We need to send our customer a secured PDF's which he'll not be able to edit at all.
I came across this article (http://www.wikihow.com/Unsecure-a-Secure-PDF-File) which shows how to crack those so-called protected files.

Please advice on how to really secure those documents.

Thanks in advance

Best way to REALLY secure a PDF

Adobe Acrobat is a family of application software and Web services developed by Adobe Systems to view, create, manipulate, print and manage files in Portable Document Format (PDF). The family comprises Acrobat Reader (formerly Adobe Reader), Acrobat (formerly Acrobat Exchange) and Acrobat.com. The commercial proprietary Acrobat, available for Microsoft Windows and OS X only, can also create, edit, convert, digitally sign, encrypt, export and publish PDF files.

Adobe Acrobat

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.

Security

Operating system security (OS security) is the process of ensuring OS integrity, confidentiality and availability. OS security refers to specified steps or measures used to protect the OS from threats, viruses, worms, malware or remote hacker intrusions. OS security encompasses all preventive-control techniques, which safeguard any computer assets capable of being stolen, edited or deleted if OS security is compromised, including authentication, passwords and threats to systems and programs.