Copyright laws have been with us since 1710(O.o wow thats alot). Now in the video of “Copyright: Forever Less One Day” it explains the process of how copyright laws were established and extended for the authors who create magical and awesome creations for society’s wonderful imagination, even though the authors need to keep creating things so no one will remake any of their works unless the authors give them permission to do so(sucks to be them).

What i would like to know is, how does the copyright laws really work?

Is it only up to lifetime+70 years after your dead or do the authors keep it and no one can take their work and remake them?

Once given permission to remake, can you remake the whole work of the author or only some parts of their original work?