No, copyright law says the copyright holder is the owner of the created work. No-one needs to say anything about what can be done with your photo/essay/code/drawing/performance etc. because the default is "nothing". Someone can ask you what you, as the copyright holder, will permit them to do with the created work on a case by case basis, unless or until you explicitly declare, using a copyright licence, what they can do with it by default.
This is why copyright is A Good Thing, because it allows, for a limited period of time, for you to decide what happens with your work. If you want to exploit it in any way you please, you can. Once that limited period of time has passed, the public domain applies.
I know this isn't always the case, with shit copyright extension legal battles, but as an idea, it's a good one.
And then if you, feeling magnanimous, decide that, either from the beginning or at some point down the road, you want others to use your work as they please, with as many or as few restrictions as you like, you can.
But the default position of any public publishing platform can, and should, be "this is my stuff, and I want you to appreciate it, but if you want to exploit it on your own, please reward my time and effort and ingenuity by providing me with kudos/pizza/beer/monetary units/whatever". If you want to engage on the magnanimity scale on some level, then you can take the deliberate step to do so, but at all times, your rights as the creator of the work are protected.
Unless you don't have a fucking clue what licence you're applying, in which case, qa'pla!