EA is working to comply with the Digital ECA Law which will effectively update features and services in EA titles for players in Brazil. This does include SWTOR.
What to expect
On May 28th, a new age verification workflow will be introduced for players who are located in Brazil. If a player in this region has not yet verified their age, they will be prompted to login to their account page on the SWTOR website to go through a verification process to verify their age.
Players in this region who do not meet the age requirements will not be able to play the game nor will they be able to make purchases through the website.
Below are links to EA articles around these updates and changes:
How to confirm your age in EA Games (doesn’t specifically relate to SWTOR)
Important note for Steam players
If you are a player located in Brazil that uses the Steam launcher and you see an error message, you will need to log into your SWTOR account page on the website to complete the age verification process.
The Steam launcher does not display a message that specifically indicates age verification is needed upon login. We are working on updating this, however it is a feature that does not currently exist. We will communicate further when it is ready to be deployed.
EDIT: Please read here for an updated list for known issues.