doc: Added copyright policy section.
doc: Added copyright policy section.

nviennot/libssh,rofl0r/libssh,jt1/honeypot-libssh,substack/libssh,sebadoom/libssh,bigcat26/libssh-mod,rofl0r/libssh,DouglasHeriot/libssh,mwgoldsmith/libssh,Distrotech/libssh,jt1/honeypot-libssh,mwgoldsmith/ssh,elastichosts/libssh,Distrotech/libssh,Distrotech/libssh,pouete/libssh,wangshawn/libssh,DouglasHeriot/libssh,sebadoom/libssh,jt1/honeypot-libssh,nviennot/libssh,pouete/libssh,sebadoom/libssh,kedazo/libssh,taikoo/libssh,robxu9/libssh,kedazo/libssh,wangshawn/libssh,substack/libssh,bigcat26/libssh-mod,substack/libssh,robxu9/libssh,kedazo/libssh,bigcat26/libssh-mod,miloj/libssh-v0.5,miloj/libssh-v0.5,pouete/libssh,taikoo/libssh,bigcat26/libssh-mod,jt1/honeypot-libssh,Distrotech/libssh,mwgoldsmith/ssh,miloj/libssh-v0.5,mwgoldsmith/libssh,pouete/libssh,mwgoldsmith/ssh,mwgoldsmith/libssh,nviennot/libssh,wangshawn/libssh,kedazo/libssh,taikoo/libssh,sebadoom/libssh,elastichosts/libssh,jahrome/libssh,robxu9/libssh,jahrome/libssh,substack/libssh,robxu9/libssh,mwgoldsmith/libssh,DouglasHeriot/libssh,mwgoldsmith/ssh,rofl0r/libssh,rofl0r/libssh,elastichosts/libssh,wangshawn/libssh,DouglasHeriot/libssh,jahrome/libssh,nviennot/libssh,jahrome/libssh,miloj/libssh-v0.5,taikoo/libssh