There is a lot of testing going on at Zunerama and ZuneThoughts about songs that can or cannot be shared when purchased or acquired through the ZunePass. Both sites are coming with numbers of around 40% of songs that can’t be shared from Zune to Zune. This is an important number considering that on of the key highlight of the Zune marketing is based on sharing and Wifi. Indeed, the Wireless device inside the Zune can only be used for sharing.
The good news is that this “feature” only exists if you buy the music directly from the online music store. If you buy a CD and rip it, you can share it to whomever you’d like. I’m willing to bet that’s what most people would do regardless, but it’s something you may want to keep in mind if you were considering picking up a single off the online store.
Source: ClicZune