This is a truth buried by history for 80 years, and a historical salvage project that took director Fang Li a decade to complete. *The Sinking of the Lisbon Maru* documents the 1942 tragedy in the waters off Zhoushan, as well as the decades-long wait and search by 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 international distributors. The international version involved frequent iterations of multilingual audio tracks and subtitle files. LI TRUST's version management and transfer system clearly tracks every transmission record, ensuring distributors always work with the confirmed final version. The film was successfully screened at multiple international film festivals, and LI TRUST was a key component of its global distribution technology chain.