Hmm.
"dude, do you think that other djs asked for permission for a remix of their songs?"
- as a matter of fact. yes. but, have a look at these:
1) You don't need permission if you create the song by yourself, using your own synths and sounds.
2) But if you use original material from the song (or the song itself), you need permission, Yeoh.
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"... if you say i must have permission to do a remix like this, why does everyone doing a remix on songs and you guys dont even comment or even report this to the owner?"
- Because, they made their remixes using only their produced synths and sounds, not using the original song itself. They made their basslines, ambients, pads, effects and etc by themselves and by hard work.
Not just by editing a song, putting it into VDJ, modulating pitches of someone's song and adding an acapella using fl studio.
Well, you can do this actually, and you can upload it anywhere but Newgrounds.
My buddy got a warning once just because he remixed Daft Punk's HBFS, using the original acapella, without permission.
Just trying to help you out dude. I'm not trying to be offensive or back up these 2 newgrounders.
Cheers.