Having a playlist on several computers wont work unless all the computers have all the songs on the playlist, and in the same place as each others.
Also, playlists dont have the MP3's in them, so putting them on a website doesnt mean the RIAA can get the mp3's. All a playlist is, is a list of songs and where they are on your hard drive so Winamp can find the mp3 and play it.
#EXTINF:262,Radiohead -  - Karma Police
D:\MP3\Radiohead\Radiohead - 00 -  - Karma Police.mp3
#EXTINF:293,Radiohead -  - I Might Be Wrong
D:\MP3\Radiohead\Radiohead -  - I Might Be Wrong.mp3
#EXTINF:252,Radiohead -  - Street Spirit
D:\MP3\Radiohead\Radiohead -  - Street Spirit (Fade Out).mp3
Thats all a playlist file is.