I don't understand your pricing. Yes, all files are compressed by default.
Some files however compress badly, usually because they are already compressed.
Many graphic formats store pictures and movies in compressed format. The Filter window allows you to indicate which files don't have to be compressed. The Rijndael algorithm has been selected by the Advanced Encryption Standard Development effort of the National Institute of Standards and Technology as the 21st century replacement of the DES algorithm. In many other applications you have to supply an encryption key yourself. Archive calculates a unique 128 bits key for each file.