"secure" None are secure if you dont know how to close ports. There's many IPfilters online that will block common scans that are likely to be malcious.
Before you Start downloading You Should know how to configure your router. To do so check here
http://www.portforward.com/
ClamAV Is a free virus scanner
http://www.clamwin.com/content/view/18/46/
Legal?
http://en.wikipedia.org/wiki/Peer_to_peer#Legal_controversy
Checkout these official ipod tutorials if you own an ipod
http://www.apple.com/support/ipod/tutorial/
http://www.apple.com/ilife/tutorials/itunes/it1-2.html
Currently there are two main p2p sources
BitTorrent and File Sharing Programs. To use bit torrent you need to download a client like azureus or bitcomet
http://azureus.sourceforge.net/download.php
http://www.bittorrent.com/
http://www.bitcomet.com/
http://www.utorrent.com/
Bit Torrent in Order of Popularity:
http://www.thepiratebay.org/
http://www.torrentspy.com/
http://www.mininova.org/
http://isohunt.com/
http://www.torrentbox.com/torrents-browse.php?news
http://www.torrentreactor.net/torrents/
http://www.torrentreactor.to/
Programs In Order Of Popularity
http://www.emule-project.org/
Emule is the most downloaded program in sourceforge history with 196,535,727 downloads. Be sure to search IP filter.
http://www.download.com/LimeWire/3000-2166_4-10494363.html
Limewire is popular among kids (spyware)
http://www.frostwire.com/
Frostwire is an alternative to limewire
http://cabos.sourceforge.jp/
Free filesharing
http://www.gnucleus.com/Gnucleus/
Another Gnutella client
http://aresgalaxy.sourceforge.net/
Ares
http://phex.kouk.de/mambo/
Phex is an alternative to bearshare and uses the gnutella network regarded as "safer".
http://sourceforge.net/project/showfiles.php?group_id=110672&package_id=119725&release_id=366441
Shareaza
http://www.download.com/1200-2025-5140766.html?part=dl-imesh&subj=dl&tag=button
Imesh
http://dcplusplus.sourceforge.net/
Direct Connect++
http://snail.pc.cz/StrongDC/indexen.htm
Strong Direct Connect
Morpheus (spyware)
http://morpheus.com/
Warez p2p (spyware)
http://www.warezclient.com/
Kazaa Not free anymore (spyware)
http://en.wikipedia.org/wiki/Kazaa
WinMX Doesnt Exist
http://en.wikipedia.org/wiki/WinMX
Sourceforge top Filesharing projects
http://sourceforge.net/softwaremap/trove_list.php?stquery=&sort=group_ranking&sortdir=asc&offset=0&form_cat=251
Wikipedia p2p list
http://en.wikipedia.org/wiki/Category:File_sharing_networks
Sourceforge Free Software List (often p2p resources)
http://sourceforge.net/top/toplist.php?type=downloads_week
Free Music From Archive.org
http://www.archive.org/details/audio
Programs
Use peer gardian 2 for protection
http://phoenixlabs.org/
To BURN Music/Video CDs/DVDs Download this free
http://sourceforge.net/projects/bwgburn
To Rip Streaming Audio Try this
http://sourceforge.net/projects/streamripper
To make sure all video/audio files work try these:
Media Player Classic Is Fast, free and Much better than Windows Media PLayer
http://sourceforge.net/project/showfiles.php?group_id=82303&package_id=84358&release_id=403110
Mplayer
http://www.mplayerhq.hu/design7/dload.html
VCL
http://www.videolan.org/vlc/
XP codec Pack
http://www.xpcodecpack.com/
Real Alternative
http://www.free-codecs.com/download/Real_Alternative.htm
Divx Free
http://www.free-codecs.com/download/DivX_Free.htm
Xvid
http://www.free-codecs.com/download/Nic_XviD_Codec.htm
QuickTime Alternative
http://www.free-codecs.com/download/QuickTime_Alternative.htm
G Spot will tell you what a video or audio file is encoded in
http://www.headbands.com/gspot/
To open 7z, rar, ace, tar, gz or other formats
http://www.7-zip.org/
To create and mix your own audio try
http://audacity.sourceforge.net/
To create and mix your own video files try
http://www.virtualdub.org/