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Note: The issue described below does not affect you if you use TrueCrypt 5.1 or later and a non-cascade encryption algorithm (i.e., AES, Serpent, or Twofish).* The issue also does not affect you if you do not use system encryption (pre-boot authentication).
Acresso FLEXnet Publisher activation software, formerly Macrovision SafeCast, (used for activation of third-party software, such as Adobe Photoshop) writes data to the first drive track. If this happens when your system partition/drive is encrypted by TrueCrypt, a portion of the TrueCrypt Boot Loader will be damaged and you will not be able to start Windows. In that case, please use your TrueCrypt Rescue Disk to regain access to your system. There are two ways to do so:
For information on how to use your TrueCrypt Rescue Disk, please see the chapter TrueCrypt Rescue Disk.
Possible permanent solution: Upgrade to TrueCrypt 5.1 or later, decrypt the system partition/drive, and then re-encrypt it using a non-cascade encryption algorithm (i.e., AES, Serpent, or Twofish).*
Please note that this not a bug in TrueCrypt (the issue is caused by inappropriate design of the third-party activation software).
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