This is a truth buried by history for 80 years, and a historical salvaging project that took director Fang Li a decade to complete. The Sinking of the Lisbon Maru documents the tragedy that occurred in the waters off Zhoushan in 1942, along with the decades-long wait and search of survivors and the families of the victims. For such a heavyweight historical documentary, the secure transfer of its production files itself carries the weight of historical responsibility. LI TRUST provided end-to-end encrypted large-file transfer services for this film, from the post-production facility to the international distributors. The international version involved frequent iterative updates of multilingual audio tracks and subtitle files. LI TRUST's version management and transfer system clearly tracks every transmission record, ensuring that distributors always work with the confirmed final version. The film was eventually successfully screened at multiple international film festivals. LI TRUST served as a key component of its global distribution technology chain.