"You shall not steal seems like a relatively safe command. We know the Third Commandment is going to trip us up, because we've all lost control of our tongues from time to time. The commands against adultery and murder, when they are considered matters of the heart, are certainly going to bring some conviction. Even the command to rest will probably cause a squirm or two. But the Eighth Commandment seems pretty safe. In one survey by the Barna Research Group, 86 percent of adults claimed they are completely satisfying God's requirement regarding abstinence from stealing.

But as the catechism points out, the Eighth Commandment forbids more than outright theft and robbery. The Eighth Commandment prohibits taking anything that doesn't belong to us. This includes everything from kids swiping toys in the nursery to plagarism in papers and sermons to online piracy." - Kevin DeYoung. The Good News We Almost Forgot. 199. 

Question 110: What does God forbid in the Eighth Commandment?

Answer: He forbids not only outright theft and robbery, punishable by law. But in God's sight theft also includes cheating and swindling our neighbor by schemes made to appear legitimate, such as: inaccurate measurements of weight, size, or volume; fraudulent merchandising; excessive interest; or any other means forbidden by God. In addition, He forbids all greed and pointless squandering of His gifts.

Question 111: What does God require of you in this commandment?

Answer: That I do whatever I can for my neighbor's good, that I treat others as I would like them to treat me, and that I work faithfully so that I may share with those in need.