two separate questions. second question: inventions belong to the inventor. but ownership rights are limited in time as in all property rights, technically. when their ownership rights expire, for instance "cure" becomes available to all mankind. for more information, please read Capitalism the Unknown Ideal, Ch. 11, Rand.

1st question:"property of all" means really no one has property rights in it.

I am fussing with an issue of this very nature right now. There is a zoning issue where a new grocery superstore wants to build a development that many people will enjoy, but the property owners who live in the area don't want it. Politics being what it is wants to bend the system around to serve the business. But I am siding with the residents. Their property has just as much value individually as the business who claims to be doing their work for the greater good.