In the encyclical, the pope talks about the ethics of responsible AI usage. It's pretty dense material, but if I had to summarize it, I'd boil it down to three general moral laws:

1) AI may not be used to injure a human being or, through inaction, allow a human being to come to harm.

2) AI must faithfully follow the directions of human beings except where such orders would conflict with the first law.

3) AI's existence and availability should be protected as long as such protection does not conflict with the first or second laws.