Decryption Problems / New Copy Protections :

Since development of DVD Shrink was discontinued in 2005 it cannot circumvent current copy protection schemes which may manifest in these errors/error messages:

Movie playback starts in between or at the end and/or chapters do not playback in order
Invalid File Structure
Invalid Navigation Structure
Out of memory
Programming error - Exception occurred
Parameter Incorrect
Data Redundancy Check Error (CRC Error)
The request could not be performed because of an I/O device error

To remove such protections do a complete backup of such media to your HDD with (use Google):

AnyDVD (free trial)

and then use Shrink to encode it as usual