RSA, DSA ElGamal

Hey guys and girls, I have been researching about encryption and come up with GnuPG, so I decided to play with it and noticed 3 different options:

DSA & ElGamal
DSA
RSA

Now I found out that DSA is a method of signing and verifying keys in a 512 - 1024 char format, and that it can be used for commercial use

Found out the ElGamal is a method of encrypting/decrypting

And found out that RSA is an algorithm for encrypting, secrypting and signing keys however it is not commercial use without licence therefore without paying

First of, would someone mind explaining what it means by patent/licence regarding RSA

Also why not just use RSA instead of both ElGamal and DSA? 1 thing does 2 things that it takes 2 things to do - get me?

Anything else I should know?

Regards

DislexiK

 

 

 

 

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