Did you have a say in your Witness Votes for HIVE? No! Did you have a say in your identity being copied? No! Did you have a say in freezing accounts? No! Did you have a say in your intellectual property being copied? No! Did you have a say in the copying of your upvotes? No! Did you have say in your digital collectibles being copied? No! Did you have a say in whether your delegations should remain? No!
Some 300 million Hive token are generated because "few" thought it is too much to handle "65 million" bought tokens.
Regarding your question, I am wondering what exact copyright we hold on it, Does it belonged to steem after our publication or it still belonged to us.
It belongs to you. No-one owns the blockchain, it's merely an indelible log of what you choose to put on it. It records the very fact and time that you published it, so would be proof of your intellectual ownership if anyone tries to steal it at a future point.
Exactly, however, when an Author publishes copy-written material, permission has to be sought to copy or store it. Where the Author decides to publish it is where the permission is granted. If I publish a book with Random House, and I then find out that Simon & Schuster has copied everything from Random House's catalog without my permission, that is illegal.
Copy-written material belongs to the Author, not the blockchain. But it is the Author who gives permission to those who wish to copy it or store copies of it, and the HIVE blockchain did not seek nor get that permission.