Hi Yihui, I intend to package the CRAN package animation as Debian package since it is a dependency of some package which is relevant in bioinformatics and packaged by the Debian Med team. When inspecting the license it says only "GPL". Debian ftpmasters are a bit picky to accept this kind of unspecific license since it is missing an explicit version (like GPL 2 or GPL >=2 or GPL 3 etc.) As far as I know only GPL is synonym for GPL 1 which is most probably not what you want.
Thanks in advance for clarifying the license Andreas.  https://cran.r-project.org/web/packages/animation/ -- http://fam-tille.de