Hyperion possess a licence to use the code, Cloanto own the code.
This leak could actually benefit Cloanto and we the community because if developers start modifying and improving parts of the codebase and those changes are posted in the public domain; Cloanto can build binaries of those parts and distribute them.
Free development for a resource constrained company. It's a win-win.
The only loser I can see in this will be Hyperion as it will cost them money to comply with the licence they signed with Amiga Inc to "defend" against any illegal distribution of the source.