Can I see proof or something? What do you mean by "locked"? Also, this is a complete run-on sentence, so I'm not even sure what you're trying to say.This is incorrect as I just tested it with my friend in 1.7.10 infinity pack and he can take stuff from my ender chest which is locked and when he changes the frequency of retains my lock I think you are thinking of the vanilla ender chest.
From chicken_bones' page: "As of 1.2, Using a diamond on the latch of an Ender Chest will move it to a seperate network for the player that used the diamond. This allows each player to have access to all 4096 frequencies without conflicting in SMP."Actually that's not how it works at all. The best explanation I've read about the locking mechanism is that it adds the name of the player who locks it as sort of a fourth "color". Other players can still interact normally with the chest, open it and take stuff, pick the chest up (it will even show the name of the owner in its tooltip), and, as I have learned in the meantime, change the channel without it losing it's player lock.
Changing channels is easy to automate using computercraft, I've seen setups that can cycle through all 4096 possible channels in mere minutes. I don't necessarily want to post this here but if you look for it you will find it. With all of this in mind, I shall now consider all my ender chests compromised, and switch my base entirely to tesseracts. Also, complain at chickenbones with a demand for change.
I've tried myself to access somebody else's ender chest before, but after I had applied a diamond to an ender chest, even with the other person's cooperation, there was no way I could access the other person's now-private ender inventory.