[VladRussian]

yep, pretty much it.

The original idea of patents was along the lines: Person A develops a self propelled buggy moving with the speed faster than light. Without patent protection, there is a lot of incentive to keep the details of the technology secret. The patent protection would be awarded in exchange of him disclosing the details of the technology, thus enriching the human race's body of knowledge and furthering the technology advancement.

Modern day patent system - a Corporation A files a patent for the idea of a "self propelled buggy moving with the speed faster than light." Whoever comes with real implementation later, would be forced to pay license fee to the corporation or wouldn't be able to bring it to market. This is pretty much the innovation tax (though if a tax isn't extorted by a government then it is more correctly called extortion/racket).