Actually, no. The media it's written on has nothing to do with it. It's still the software that is on it. If you want a blank cd I'm sure they'll give you one in trade. There have been examples of software licenses being pulled and it is the MEDIA that is pulled from the site. Otherwise they could re-install the software. Duh.
Read the agreement carefully. It's a lot more limiting than you might think.
The contractors on the second Death Star knew the risks when they took the job. All contractors have to take these things into consideration when they take a job--Clerks