Found at rabenhorst: PGP Corporation disrupts PGP Freeware Mirror. I always find it disgusting when I look at what has become of the old PGP project, which has now turned into a commercial mess. PGP was once the pioneer in making usable cryptography available to ordinary citizens—and during the PGP 2 versions, it was indeed openly available (up to version 2.3 under GPL). For exactly this reason, I made the PGP ports to DOS back then. And now the PGP Corporation is lashing out and taking action against free mirrors of the freeware versions. A good example of why it's better to invest energy in projects that belong to companies, but rather in freeware with free as in free speech...
Therefore: use gnupg. The code is also better—I still remember with horror the pseudo-object-oriented code in PGP 5, fixing that stuff was not really entertaining.
By the way, the changelog for the DOS version of PGP 5 (scroll down) was my first weblog, so to speak—and that started as early as October 97. Should I now challenge Dave Winer?