Originally Posted by Xne
And judging from my speculation on SEA LOL forums and the current forums.
Only one person from SEA is currently blocked.
ryuicHi mAtzO2 is his name, he made two topics about being blocked, nothing to do with SEA ip addresses by the looks of it.
Three topics, and I believe the NA and and EU servers allow for overlapping players because they're both handled directly by Riot. I think there was a while where they didn't when (I think it was?) GOA was handling the EU. GOA sucked though, so Riot took over.
I'm pretty sure some other company is handling SEA LoL so they will probably become exclusive servers. It's a corporate thing. Entirely possible it won't happen though.