Public Domain

Sounds boring
Looks Boring
Its the kind of phrase that doesn't interest many people.

PUBLIC DOMAIN:

defined as ...

... the status of a published work or invention upon which the copyright or patent has expired

or

which has not been...

patented or subject to copyright. It may thus be freely used by the public.

by Dictionary.com

but I am interested in what it says in plain english

 the first bit is easy.

It basically means

property rights that are held by the public at large

or

Publically owned rights 

Still think its boring...

...Oh

it's not that boring