Laws
Most laws focus on protecting the privileges and rights granted under feudalism. So, a serf may be brought to manorial court for grinding his own grain (infringing on the privilege of the miller), trying to trap small game (infringing on the privilege of the lord), or failing to keep his home in repair (failure in his duty as a serf); as well as for more familiar crimes like robbery or murder. In the case of serfs, manorial court is often a last resort — serfs who fail in their duties are typically just given a good hiding by the reeve. In town, laws are generally in place to protect the trade franchises of the guilds and the charter of the town. A man may find himself in the position of lawbreaker for failing to maintain his home or the street in front of it, for illegally attempting to compete with the guilds, or for illegally throwing waste in a sewer. The single most punished crime in cities is failure to contain one's pig. Crimes of trade are treated very harshly — the guilds have legal monopolies and guard them jealously.
This focus of laws on feudal responsibilities makes the laws seem strange to modern eyes. A serf who kills a deer in the king's forest, for example, faces execution. His crime is directly against the king, and therefore is treason. If the same serf murdered another serf, however, he would likely only be fined — if he were executed, the lord would lose the labor of two serfs instead of just one!