Spotify is set to offer offline versions of its playlists to PC users as well as those on mobile phones.
A keen-eyed Twitterer spotted the clause in the Terms and Conditions of the new mobile app, stating that up to three PCs can stored the cached songs.
Terms and conditions
"As a subscriber to the Premium Service, you are permitted to store such cashed content on up to three PCs. If you are a subscriber to the Mobile Premium service, you are permitted to store cached content on up to three PCs and three mobile handsets," read the T&C's.
"You may not transfer copies of cached content to any other device via any other means."
At least Spotify is making its premium account more attractive - although it's likely Napster will be annoyed that it couldn't make the same service work three years ago.