Excellent question, Thomas!
All DPS versions prior to 126.96.36.199 either required purchase or at least a login with email and password. Email and password data was stored securely in the OSX keychain. Version 188.8.131.52 BASIC is the first free version that does not require email or password to use. It is requesting access but does nothing with the data.
However, we are keeping the keychain mechanism in place for the upcoming June release of DPS 2.0 FULL VERSION which will require purchase and storing of private information. Using the keychain will allow easy software upgrades and storing of your previous purchases.