Corvee - Limiting Free Labor

In reading about the charter of Lorris in 1155, I came across a word that was unfamiliar, corvee, so I did what I often do and looked it up. Corvée as it turns out is "labour, often but not always unpaid, that persons in power have authority to compel their subjects to perform, unless commuted in some way such as by a cash payment; sometimes this was an option of the payer, sometimes of the payee, and sometimes not an option." Basically, for the protection or other benefits you received as a peasant or other subordinate of a Lord or master over you, a certain number of days of unpaid labor may be expected of you. Of course, this would not go over well these days. The actual part of the charter where it is mentioned states, "15. No inhabitant of Lorris is to render us the obligation of corvee, except twice a year, when our wine is to be carried to Orleans, and not elsewhere." I am sure that corvee was used and abused pretty harshly by some notorious noblemen in the past and they were seeking to curb that. Not exactly profound, but putting limits on free labor was probably a big deal to those who already had a hard enough time making ends meet.