Back in this era, game publishers were desperate to prevent piracy. SecuROM v4 introduced a technology that checked the physical structure of the CD/DVD drive to ensure a genuine disc was inserted. This often broke compatibility with legitimate users who had certain brands of DVD drives or, more commonly, users who utilized or Alcohol 120% —software used to mount disc images (ISOs).
Backup your registry first.
Since it is old and unmaintained, downloading it from untrusted sites carries a high risk of malware. Compatibility: sd4hide.exe