False. You do NOT have the right to restrict what I do with "your" ideas, once you've shared them with me - be it software, sonnet, or poem. The government may limit my fundamental freedom by enforcing a limited-time monopoly, but only in order to encourage you to work on your ideas.
It is NOT your fundamental right to have such monopoly indefinitely.
Nobody is restricting you from creating a similar food or software (unless there is a patent, which is an entirely different issue). You have the right to create your version, and I have my right to sell only the product, not the process that made it.
I often wonder what RMS would do if he had the power to enact a law mandating that all software be free software - as a form of "positive liberty". Judging by his writings, I get the feeling he'd do it.
My copyright of a work doesn't restrict your ability to copy the idea. In fact, this is what many Open Source projects do: they copy the idea or a proprietary software, but not the software (ie. the work) itself.