It was very common to find that kind of software on magazines' CDs. For example, I installed for the first time WinRar after finding it inside a promo-CD of a magazine (I don't remember the name). I guess the 'share' was because the license was(is) permissive in terms of distribution (internet mirrors, magazines' CDs, promo floppies, etc...) and after a certain amount of time, it was required to pay the license to keep using the software.