To supply of a data set, e.g. the content of a copy protected audio CD, which is stored in a database (6), e.g. to a user PC (2) on which said content of a copy protected audio CD cannot be accessed, the following steps are performed: receiving a serial code of a set of serial codes assigned to said data set (S3); verifying of said received serial code (S4); in case of a positive verification, accessing said data set corresponding to said received and positively verified serial code from said database (S5, S6); and outputting of at least parts of said accessed data (S7).