Last year, I created a derived work from published source code that was distributed unlicensed on a blog. Recently, I went back to the blog and noticed it was now licensed under CC BY-SA 3.0. Is my derived work also bound by share alike now?
Non-licensed source code later becomes licensed
licensing;creative commons
A license doesn't restrict what you are allowed to do, a license gives you permission to do things that you would not be allowed to do without the license. If that code had no license, then you had no right to use it, and creating a derived work was copyright infringement. You are lucky that it is now licensed. 