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A copy protection mechanism is a delicate component that must be invisible to legitimate users and cope with different software and hardware configurations. The following are the most important design considerations for software copy protection schemes. Resistance to Attack It is virtually impossible to create a totally robust copy protection scheme, but the levels of effort in this area vary greatly. Some software vendors settle for simple protections that are easily crackable by professional crackers, but prevent the average users from illegally using the product. Others invest in extremely robust protections. This is usually the case in industries that greatly suffer from piracy, such as the computer gaming industry. In these industries the name of the game becomes: Who can develop a protection that will take the longest to crack That s because as soon as the first person cracks the product, the cracked copy becomes widely available. End-User Transparency A protection technology must be as transparent to the legitimate end user as possible, because one doesn t want antipiracy features to annoy legitimate users. Flexibility Software vendors frequently require flexible protections that do more than just prevent users from illegally distributing a program. For example, many software vendors employ some kind an online distribution and licensing model that provides free downloads of a limited edition of the software program. The limited edition could either be a fully functioning, time-limited version of the product, or it could just be a limited version of the full software product with somewhat restricted features.

Bias,

9

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Let s ignore the current computing architectures and try to envision and define the perfect solution: The Uncrackable Model. Fundamentally, the Uncrackable Model is quite simple. All that s needed is for software to be properly encrypted with a long enough key, and for the decryption process and the decryption key to be properly secured. The field of encryption algorithms offers solid and reliable solutions as long as the decryption key is secure and the data is secured after it is decrypted. For the first problem there are already some solutions certain dongle-based protections can keep the decryption key secure inside the dongle (see section on hardware-based protections later in this chapter). It s the second problem that can get nasty how do you decrypt data on a computer without exposing the decrypted data to attackers. That is not possible without redesigning certain components in the typical PC s hardware, and significant progress in that direction has been made in recent years (see the section on Trusted Computing).

COV,

Let us discuss the different approaches to software copy protection technologies and evaluate their effectiveness. The following sections introduce mediabased protections, serial-number-based protections, challenge response and online activations, hardware-based protections, and the concept of using software as a service as a means of defending against software piracy.

Advice from Joe Glanfield:

Table 18.3 Resistance factors for axial loaded driven piles in sand calibrated to ASD and FOSM (D/L = 3.7, D = 1.3 and = 2.17) (after Barker et al. 1991) Resistance factor , Soil test SPT SPT CPT CPT Pile length (m) 10 30 10 30 Factor of safety, FS 4.0 4.0 2.5 2.5 Target reliability, T 2.0 2.0 2.0 2.0 Reliability analysis, 0.48 0.51 0.59 0.62 Fitting with ASD 0.33 0.33 0.53 0.53 Recommended 0.45 0.45 0.55 0.55

Media-based software copy protections were the primary copy protection approach in the 1980s. The idea was to have a program check the media with which it is shipped and confirm that it is an original. In floppy disks, this was implemented by creating special bad sectors in the distribution floppies and verifying that these sectors were present when the program was executed. If the program was copied into a new floppy the executable would detect that the floppy from which it was running doesn t have those special sectors, and it would refuse to run. Several programs were written that could deal with these special sectors and actually try to duplicate them as well. Two popular ones were CopyWrite and Transcopy. There was significant debate on whether these programs were legal or not. Nowadays they probably wouldn t be considered legal.

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