There are many things to consider if you are looking to download MP4s. Since the inception of Napster and other peer to peer network programs finding and downloading pirated MP4s has been incredibly easy. Today there exists a number of both legal and illegal ways to get these files. Before you decide on what and how you are going to get your files you need to understand the legal and personal implications of what you are doing.
There are various options for free MP4 downloads these days. The most common is the BitTorrent file. BitTorrent is not a file type but rather a protocol that allows users to share and distribute massive amounts of data. It was based and built off of the many of the earlier peer to peer programs of the past. Currently it is estimated that BitTorrent traffic makes up 35% of all traffic on the entire internet. The process for uploading and receiving BitTorrents is fairly simple. One person will first distribute a complete file. This is called seeding. As more people download the file, more of it will be seeded online increasing the speed at which peers can download it and share it out. As more and more computers online begin sharing the file it will become easier and easier to download. While there are other methods to get MP4 files this is by far the most common and easiest to use. There are a myriad of different clients you can use to manage the download of your BitTorrents but all of them perform the same basic function.
Some torrent sites require membership to get access to the torrents they provide and the peers that share them. This pay sites in general will have some of the best and easiest to download content around. In addition by working within a community there will be a certain amount of accountability between members and most of the harmful MP4 torrents you can find through other free sites will not be as common.
As useful as the BitTorrent format is it also has many complications. Most of these are caused by people seeking to do harm and wreak havoc on systems. Others are out to make money through embedded spyware programs that pay them on a per click basis. If you do decide to use and download BitTorrents make absolutely sure that the files you are getting are free of these programs. This can be very difficult to tell just from looking at the file, but often times BitTorrent files will have user comments associated with them and the providing site. These can be very helpful to avoid harmful torrents. Torrents can have viruses, spyware, and other harmful programs embedded in the main file that you may not be able to detect. If you do download torrents you must have some sort of virus scanner and spyware removal tool on your computer as more than likely it is only a matter of time before you get infected.
In addition to this, many of the MP4s that you download have been uploaded illegally. This could offer some serious penalties especially if the computer you are working is a business PC. One thing you can look for is live shows of bands you like. For the most part these are free to be distributed and generally have no legal implications.