Use the wall-sign to protect your blocks!
update log:
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allow transfer if the same owner of source and target inventory.
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allow place sign-lock while side block is snow layer or water or grass.
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物品传输事件，当源容器和目标容器所有者相同时，允许传输。
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允许在侧面为雪层或草或水方块时，直接放置告示牌锁。