I know that I have to manipulate the Tricerasoft songs to get them into the format (in terms of file name to Artist-song-disk-track) so that compuhost can recognize them in their database.
For convenience I do this on a backup copy but on my same computer (and hard drive), so it appears they have no protection.
I love their 100 song packs I think I have done 5 so far.
As for downloads yes, the UK laws are a lot lest strict for legal downloads of karaoke compared to the USA.
In the USA a contract with the songwriter/publisher of the origional music must be made in advance with the number of copies specified, and that makes selling for downloading difficult. Some US companies seem to ignore or avoid the laws somehow, but SC is big enough that they cant flaunt the laws. SC does sell downloadable karaoke but in a propritary format that no-one seems to be using but them.
In the UK as long as the standard royalties are paid downloadable songs are less of a legal mess. Sunfly and Zoom are the main UK companies, STTW and SBI are smaller but good. There are a couple dozen very small UK companies that make karaoke as well but have very small songlists. Some are good. Many can be found at select-a-track
http://www.selectatrack.com/index.aspx
but they are a lot more expensive than tricerasoft, but have a lot of hard to find songs.