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Tagès

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Tagès
Developer(s)Tagès SA
Stable release
5.5.7.2 / 2009
Operating systemMicrosoft Windows
TypeDigital Rights Management
LicenseProprietary
Websitehttp://www.tagesprotection.com

Tagès is a software copy protection system, jointly developed, at first, by MPO and the Thales Group (formerly known as Thomson-CSF) starting in 1999. Its method of protection has since been described as twin sectors.

The name 'Tages' originates in the Etruscan mythology, where it functions as the Latin spelling for an alias of a minor deity, Tarchies.

The first software product to be protected by Tagès was a PC game, MotoRacer 3, developed by Delphine Software (DSI) and released in 2001.

In 2003, an independent company, Tagès SA, was formed. The company focuses on the development of Copy Protection and Digital Rights Management systems, and is now the sole vendor of the Tagès copy protection system.

The Tagès copy protection system is compatible with the Microsoft Windows operating system, and is employed on CD and DVD discs.

The makers of Tagès claim that one of the main strengths of their product is the incorporation of a "Secure Area" on a physical medium, which renders the production of a relatively perfect copy of a protected disc a nearly impossible task. Additionally, a set of anti-cracking instruments is being provided with the protection system (such as TAGESCAP, Tagès APIs and Tagès VFS); this is claimed to make the reverse-engineering of Tagès-protected applications a difficult and time-consuming task.

Features

  • TAGESCAP - A binary wrapper which is applied to the software application's executable file and requires no changes to the source code of the application. It provides the encryption of the protected product's executable file(s), and attempts to protect the application against debugging, disassembly, reverse-engineering, and other forms of analysis. The authentication procedure only carries out a single check, which will be carried out at the start-up of the protected application.
  • Tagès APIs - A set of libraries allowing the developer to implement a set of fully customized "protection triggers", potentially appearing at any stage of the protected application's execution phase. For instance, should a non-authentic copy of a protected product be detected, the developer of that software product can decide upon the actions to be taken under such circumstances, such as electing to silently degrade some aspects of the product's functionality. The Tagès APIs require modifications and additions to the source code of the protected application. A consequence of silently degrading or crashing a program that fails authentication is that users have no way of distinguishing between intentional protection behavior and application bugs. This has resulted in support centers receiving large volumes of calls that were eventually determined to be for pirated copies.[1]
  • Tagès VFS - An encrypted virtual file system, allowing the developer to additionally encrypt non-executable content. When a successfully authenticated protected application runs, it has transparent access to the original, decrypted content; this functionality is achieved by means of a device driver. Should a protected application's authentication phase be successfully removed by means of deliberate circumvention, the encrypted content is not decrypted and is therefore read in as garbage data, resulting in erroneous program behavior. However, just as the encryption of the executable can be broken, so too can the encryption for the VFS, with additional effort.

Tagès device drivers

As with most optical disc-based copy protection systems (such as SafeDisc, StarForce, etc.), Tagès installs its own device drivers as a part of the copy protection system. The Tagès device drivers are installed on the first launch of any Tagès-protected application.

Removal

Tagès SA provides an official, standalone, device driver installation and uninstallation program.[2] This program functions as a toggle; once the Tagès device drivers are installed, the program will function as an uninstaller, otherwise, it will function as an installer. Both 32-bit and 64-bit versions of the program are available.

Known Issues

Tagès utilizes techniques that exploit undocumented idiosyncrasies in operating systems and hardware. This can sometimes result in the copy protection system failing if the idiosyncrasies are no longer displayed due to a patch or new version of operating system or driver.

The protection is not that difficult to break. It relies on creating "twin sectors". These are sectors with the same logical address, but different data. Depending on how the CD is accessed different data may show up when requesting the same sector, which indicates the disk is an original one. It is somewhat hard to read such sectors sequentially in order to copy the disk, but writing them to disk is very easy.

See also

References

  1. ^ http://multiplayerblog.mtv.com/2008/10/13/bethesda-deals-with-pirates/
  2. ^ Tagès drivers version 5.5 - signed version
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