I'm building a library that is based on a modified version of an already existing source released under the GPLv2 license.
I'm modifying each files of the original project to adapt it to my needs, so I'm adding to each file my copyright notice leaving the one of the original author.
I'm releasing it under the GPLv2 as well.
My question is related to the compiled binaries and to the copyright notices on it.
.net libraries give you the possibility to add a copyright statement in the information of the library, but should I put only my copyright notice or should I mention the original author too?