A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
A player, 31 October 2007
Courage Bushido Virtue Battle: Until this battle ends, other players’ cards' effects can not move home your honorable Samurai. Bushido Virtue Battle: Until this battle ends, other players’ cards' effects can not bow cards in units led by your honorable Samurai.
The Ruined City You do not loose Honor from Fate and Spider Clan cards you own. Your Spider Clan Personalities have the ability, "Battle: Bow a target unit with zero total Force or with the lowest non-zero total Force (including ties) among all units at the current battlefield."
Is the granted ability considered 'other players’ cards' effects' with regards to Courage?
Chris Fuchs (rules official), 31 October 2007
Courage Bushido Virtue Battle: Until this battle ends, other players’ cards' effects can not move home your honorable Samurai. Bushido Virtue Battle: Until this battle ends, other players’ cards' effects can not bow cards in units led by your honorable Samurai.
The Ruined City You do not loose Honor from Fate and Spider Clan cards you own. Your Spider Clan Personalities have the ability, "Battle: Bow a target unit with zero total Force or with the lowest non-zero total Force (including ties) among all units at the current battlefield."
Is the granted ability considered 'other players’ cards' effects' with regards to Courage?
Yes.