I was able to read you message bigmanik. There are some tutorial already posted by some of the forum members where you can learn more about PGP. You will need to find them. I had to google my self too to learn about Philip Zimmermann LOL
I make a research and understand why you had to google about phil Zimmermann and I also not familiar with Phil until I know that he is the one who created pgp even though I have used PGP before. I think it's also useful to use PGP to encrypt a seed phrase and hope it will increase the security and if it is safe. More like an experimental about using PGP for seed phrase.