If you are wondering about whether you need to pay royalties to record Jolie Blonde, or a tune that is based on Jolie Blonde, the answer is, no. There are many copyrighted versions, but those are copyrighted arrangements, or copyrighted versions of the song. The song itself is traditional.

Most traditional Cajun songs do not have a fixed text, and Jolie Blonde is among them. There are nearly as many different sets of words as there are singers of the song. To complicate matters further, it's not uncommon for a singer to sing different words to a Cajun song. Often, the lyrics are drawn from a set of floating phrases or verses and just plugged into whatever song the singer happens to be singing.

This is not true for actual written songs (like "Porte En Arriere" for example) but it definitely is the case for the vast majority of older waltzes and twosteps. If you analyze Amede Ardoin's lyric content, there's only about a song and a half worth of lyrics, used in about 20 songs!