The protection of adobe documents has mainly been done with the help of passwords and encryption techniques. Adobe password protection technologies were aimed at preventing unauthorized users from viewing, printing, or making changes to published documents. Early technology used 40 bit strength encryption but tools for breaking such small encryption lengths soon became readily available. Luckily for PDF document owners, reprieve came in the form of 128 bit strength encryption which was able to hold its own against accessing of the document but was not implemented for document controls so anyone knowing the password to access the document could still use a tool to remove any document restrictions.
There are plenty of websites online that offer adobe password protection cracking solutions for PDF documents, ensuring that your documents can be forwarded to and viewed by unauthorized persons. The perfect solution, strong enough to counter such risks, lies in DRM which implements reliable document access control to thwart unauthorized copying, viewing, modifying, saving, screen grabbing and printing. You can control your PDF documents regardless of their location. You can also set expiration dates to determine how long these documents can be viewed, or to allow access only when subscription fees have been paid and deny access when payments are overdue.
Whilst 128 bit encryption cannot be readily broken when a long password is used, adobe password protection is made vulnerable when people apply weak passwords (such as those with few characters or based on common words that people can easily guess). Still, there are sources that claim to have the ability to crack adobe documents despite the use of 128 bit encryption or the strongest of passwords by using brute force attacks. Concerns about these risks have led to a shift from adobe password protection technology to the adoption of public key systems. However, this also has its challenges in that many public key systems are complicated because most don't involve key management procedures and there are security flaws such as the ability for users to share their private keys with others.
With DRM document access control PDF passwords are no longer necessary. Document decryption keys can be transferred to a secure keystore on the users computer and the document decrypted in memory and displayed in the DRM's secure Adobe viewer. Unprotected documents are not stored on the disk. Modern DRM document access control techologies use the highest strength encryption i.e. AES 256 bit and thus they provide an enhanced system which document owners can use to enforce copyrights over their works by securing all the controls available to the document's recipients.
DRM document access control systems provide a simple but cryptographically secure way of handling customer registration. They involve the transfer of the actual decryption keys to the registered product via secure key exchange protocols, and holding the key in a secure manner prior to its use. Only authorized users can thus receive files and use them, but they cannot transfer their user rights to other computer systems unless authorized. Keystores are locked to specific computers and thus users cannot transfer these to other parties. In essence, the supplier/document owner is guaranteed of his/her revenue stream at all times.
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