This is so not correct.
The authorsrights belongs to you (non-negotiable).
You give away the copyright (the license to use).
No. I gave everyone the license to use it under certain terms. This is not the same as giving away the copyright, which to me implies transferring
all rights to someone else. I relinquished a subset of the rights given to me by copyright law, but not all; specifically:
"You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work)." (Attribution)
"If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one." (Share Alike)
"For any reuse or distribution, you must make clear to others the license terms of this work."
(Short name for the license is BY-SA and the full legal code
here.)
Now, considering the terms are very generous, I suppose some would say it's
practically the same as giving away copyright, in which case we're just arguing semantics. But for some people wanting to incorporate some of these pictures as derivative works in another work, the "Share Alike" part might make it impossible:
"The Share Alike aspect requires all derivatives of a work to be licensed under the same (or a compatible) license as the original. Thus, if a person were to use parts of a BY-SA movie to create a new short film that new short film would also need to be licensed as BY-SA. The advantage of this license is that future users are not able to add new restrictions to a derivative of your work; their derivatives must be licensed the same way."
...and the only way to get around having to license the new work under the same license would be to ask me, the copyright owner, for permission.