Output is absolutely clear – no differences! No authors, no changed files, no trademarks, just copy-paste development.
Is this a blatant disregard for the GPL and Apache licenses by an optimistic startup, or were the authors too eager to release that they forgot to provide access to the repo?
Opensource.com: Is there a practical way for a developer to be sure they're not infringing on a software patent?
There are approximately 400,000 software patents currently in force and about 50,000 new software patents every year. And each of these patents has multiple claims. One paper estimated that if all software firms conducted thorough patent clearance, the annual cost of that process would be greater than the market capitalization of the entire industry.
Firms can do targeted searches to try and minimize risk (looking at the patent portfolio of direct competitors, for example), but they will always be at risk of surprise patent attacks.
Suggest you just sit there and wait till life gets easier.