Given how copyright law works, you need to grant Dropbox (and any similar services) those rights, otherwise they can't provide their service with your files. w

Given how copyright law works, you need to grant Dropbox (and any similar services) those rights, otherwise they can't provide their service with your files. worldwide = For the whole internet non-exclusive = You can still license your stuff to others royalty-free = Dropbox doesn't have to pay you for this license sublicenseable = The license you grant Dropbox can be transferred to other companies, in the event of a company merger or similar rights to use = Doesn't mean anything copy = So they can copy your files between their internal servers distribute = So that they can distribute your public files to other users prepare derivative works of = So they can create thumbnails, extracts, previews etc perform = Doesn't mean anything or publicly display = List your public files to others