1, cactus data shield: music CD protection technology. There are three versions of CDS- 100, CDS-200 and CDS-300.
Protection mechanism: A common music CD protection technology, in which an electronic automatic recording sector is added to the CD to interfere with the operation of the CD during the copying process.
Application and difficulty of backup: there are few music CDs used, but it is said that it is not widely accepted because of its poor compatibility with CD-ROM playback equipment, and it is easy to backup successfully.
2. Data CD protection technology.
Protection mechanism: add a protective cover to the installation program, and verify the password (generally 8 digits) during installation.
CD-ROM features: There are CDCOPS.DLL files in the installation directory.
Application and difficulty of backup: the older technology is rarely used now, and it is easy to backup successfully.
3. Data disc protection technology.
Protection mechanism: encrypt the execution file on the CD, add the digital signature to the CD when pressed, and map it to the serial number of the software, and compare the serial number with the digital signature when the software is executed.
CD features: The installation directory contains IOSLINK. VXD and IOSLINK. SYS file.
Application and backup difficulty: uncommon. Using the appropriate recording software correctly, the backup is easy to succeed.
4. Virtual file: data disc protection technology.
Protection mechanism: Modify the ISO code related to the file size, and create an oversized fake file, so that the total capacity of the CD can be displayed as 2GB at the maximum, resulting in the common illusion that 650MB and 700MB CDRs cannot be backed up.
Features of CD-ROM: It shows that there are oversized files (700 MB-2 GB) in the CD-ROM.
Application and backup difficulty: uncommon, easy to backup successfully.
5. Secure CD: Data CD protection technology. According to different protection mechanisms, it is usually divided into three versions: 1.0, 2.0-2.4, 2.5 1.
Protection mechanism: Before 2.4, the digital signature was embedded in the Safedisc protection disk during tabletting, and the digital signature could not be backed up by the early burners. Safedisc after 2.5 1 adopts weak sector technology.
CD-ROM features: There are files such as 00000000.0 16, 0000000.256, 000000 1.tmp in the CD-ROM.
Application and backup difficulty: It is very common on game discs. For example, EA's games have adopted various versions of Safedisc for a long time. Before 2.4, some recorders of Safedisc protection disk can be successfully backed up, but after 2.5 1, it is more difficult to back up successfully.
6.SecuROM (new): Data CD protection technology.
Protection mechanism: add the electronic fingerprint of SecuROM when pressing the CD, and the verification program in the CD checks the electronic fingerprint of SecuROM when the program is running.
Features of CD-ROM: CMS 16. DLL，CMS_95。 DLL，CMS_NT。 DLL and other files on the CD.
Difficulty in application and backup: It is widely used, and most recorders can be backed up successfully with the correct software.
7.TAGES: The latest data disc protection technology.
Protection mechanism and CD characteristics: unknown.
Application and difficulty of backup: Because it is a new technology, few CDs are used, so far there is no precedent for successful backup.
8. Stellar: The latest data disk protection technology.
Protection mechanism: The principle is similar to CD-Cops, but it is improved.
Disc characteristics: unknown
Difficulty in application and backup: It has been popularized in the game industry, and this technology has been adopted by Heroes of the Three Kingdoms and Xuanyuanjian 4. Don't waste CDR, there is no successful precedent at present.
Three important factors for successful backup:
1, a burner suitable for perfectly backing up compact discs: Different burners have different abilities to back up compact discs with anti-copy protection technology. It should be noted that whether the recorder supports the RAW-DAO 96(2352 bytes of original data +96 bytes of SP-W auxiliary channel data) recording mode is a very important factor for correctly backing up protected optical discs such as DiscGuard and SecuROM(new). In addition, it is still necessary for the burner to correctly execute EFM coding. Safedisk protects the backup of the CD and tests the correct writing ability of the EFM code of the burner.
2. Optical drive with RAW+96 reading mode (2352 bytes of original data +96 bytes of SP-W auxiliary channel data). The 96 bytes of SP-W auxiliary channel data include digital signature, CD-Text, ISRC (International Standard Audio-Visual Data Code), CD+G, CD+MIDI, section gap and Crazy TOC (Incorrect CD Directory List). If these auxiliary channel data are to be successfully recorded, they must first be read correctly by the optical drive. If you read the original disc directly with a burner and then back it up, then your burner should support the RAW+96 reading mode and the RAW-DAO 96 writing mode.
3. Choose the appropriate recording software and set it correctly: At present, the popular recording software includes Nero-Burning Rom, Eaey CD Creator and Direct CD. It is easy to use in hard disk data backup, bootable CD production and audio-visual CD production. However, these softwares are not the best choice for perfectly backing up and protecting CDs. CloneCD, Blindread/write, FantomCD should be the first choice to protect CD. When using CloneCD, Blindread/write and FantomCD, we should choose the corresponding reading and writing options according to the different characteristics of optical disc protection technology. For example, backup a SecuROM (new) protected CD with Blindread/write. When reading the original CD to make a mirror image, check the option "Extract subcode (if your CD-ROM drive supports it)" (the subcode it refers to is the auxiliary channel data we mentioned earlier).