Password protected PDFs can easily be cracked and the document security features removed. A simple search on any major search engine will reveal numerous PDF password removal applications and workarounds that are easily and freely available. These can be used to remove all PDF restrictions and in many cases the password required to access the document (the open password).
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If the Document Open password uses 40-bit keys (Acrobat 3 compatible encryption) then PDF Password crackers guarantee to remove it. Many online PDF password remover tools can create an unlocked PDF in seconds.
The stronger the PDF document open password, the longer it will take to crack. A strong password consisting of at least 32 characters, a non-dictionary word, and multiple NON-alphanumeric characters could take weeks to crack.
No. Regardless of whether they use strong encryption, the encrypted PDF file is still protected with a password that can be cracked or shared. A password-protected PDF file provides weak security and should not be used in a business environment for protection of confidential or sensitive information.
Nondestructive evaluation methods are widely used in quality control processes for critical components in systems such as aircraft engines and nuclear power plants. These same methods are also used in periodic field inspection to assure that the system continues to be reliable while it is in service. This paper describes a detection algorithm to automatically analyze vibrothermography sequence-of-image inspection data used to detect cracks in jet engine fan blades. Principal components analysis is used for dimension reduction. Then the fitted coefficients of the first principal component are processed by using robust regression to produce studentized residuals that are used in the crack-detection rules. We also show how to quantify the probability of detection for the algorithm. The detection algorithm is both computationally efficient and accurate. It correctly identified several cracks in our experimental data that were not detected by the standard human visual inspection method.
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