Totally free access to the data set for anybody, either academic or not. This category comprises public datasets that the owners didn't restrict the access for, in any way.

Free data set access; the users will only have to pay the costs related the storage media used for sending the data set (e.g. floppy disk, CD etc.); RODA may distribute the data sets without asking for the owner’s approval.

Data access restricted by the owner's written approval, whereby the owner gets involved in the data set access control activity, taking the final decision as to any person's access to the data set.

Owner-restricted access based on a confidentiality contract; the data set can only be accessed against payment by the user of a certain amount specified by the owner.