In the early 2000s, legitimate paying customers often encountered a frustrating reality: dragging and scratching a physical game disc over time could render it unreadable, yet the law did not allow for making a personal backup due to the Digital Millennium Copyright Act (DMCA) in the US and similar laws globally. sd4hide.exe became a tool used in a legal gray area to allow owners of original software to play from a backup copy without inserting the original, fragile disc.