Oracle logs structure

I thought that specification of the Oracle log files is not publicly available and Oracle prohibits anyone from reverse engineering the logs.

In other words whoever wants to parse the logs directly should be using either GoldenGate or LogMiner. Well, there is a way to parse them via RMAN API - Delphix but the question is about decoding raw log files directly.

Surprisingly I discovered that at least two product DO parse Oracle log files:

Informatica and AWS Database Migration Service

Now the questions are

1) Is specification for Oracle log files available somewhere?

2) If not - then do above companies brake the law or there is some kind of special agreement?