If buying used Autocad CD off Ebay & the like , is it allowable to transfer the licence to new owner please ?
No. The EULA clearly states that your license is not transferrable. You will not be able to activate the software because it will be registered to another owner. This is fraud.
Yeah, I really hate to see good people get ripped off. It's always better to be safe than sorry. Glad you asked. There's always a chance your post will help someone else in the future as well.
And considering the courts just recently sided with AutoDesk (no license transfer), there are going to bre a lot of mad buyers out there.