Captive NTFS is a discontinued open-source project in the Linux programming community, started by Jan Kratochvíl.
By taking this approach, it aimed to provide safe write support to NTFS partitions.
Until the release of NTFS-3G, it was the only Linux NTFS driver with full write support.
Captive NTFS requires NTFS.SYS, which cannot be freely distributed for legal reasons.
It can either be obtained from an installed Windows system (which most computers with NTFS partitions are likely to have) or extracted from certain Microsoft service packs.