> The only difference between those files and, say, a DVD, is that the encoding is more space-efficient.
Also that it's (depending on the format) perhaps not illegal to use the content in the file wit any viewer you choose.
Which does not depend on the data being on a DVD at all, but the details of contract of purchase. When you buy the data on a harddisk, the exact same terms would apply.
Which does not depend on the data being on a DVD at all, but the details of contract of purchase. When you buy the data on a harddisk, the exact same terms would apply.