I have bought many of that CD-Sets by Dire Straits back in the early 1990 in Germany in various record-shops, incl. the Media-Markt departementstores. Much of them were made in Italy, Luxembourg and so on. Yes, in a special time-span, those discs were legally available between the official stuff in the cd-shelfs. I´m not sure to 100 percent, but it can be, that the copyright laws changed somewhere in the 1990 and "over night" all of those discs dissapeared from the record-stores. Now they are be found on record-fairs, sometime on fleamarkets or thrift-stores with many luck and it is "dangerous" to sell them on the well known online marketplaces, especially in Germany, because there are some specialized lawyers, who are searching for those records systematically. It can be very very expensive, to sell such discs, now. Most of such records on the CD format or on vinyl are in the hands of the collectors.