Copyright is concept which protects the original work of creator and gives them legal exclusive right of the item. This gives copyright holder right to sell, use or resell their work to anyone. Only copyright holder can create derivative or alter his work in anyways. Holder can make copies of his work and distribute them and can sell original or altered version of his work. The creator of a work holds copyright even if they don’t expressly say so.
More information about copyright law can be read from following link United States Copyright Law
Some violation made by author may cause temporary lock on authors account while more serious violation may cause authors account disabled completely and all his cash withheld indefinitely. Once account is disabled due to serious violation user can not register a new account with the site.
Violations those may lead to disabled accounts include, but not limited to
Violations those may lead to temporary lock of account include, but not limited to