Oui, les mêmes.
Plus exactement, c'est l'algorithme de compression LZW utilisé par GIF qui était breveté :
« LZW was described by Terry A. Welch in the June 1984 issue of IEEE's Computer magazine. Unisys held, and still holds a patent, on the procedure described in the article, but the article describing the algorithm made no mention of this. Welch, a Sperry employee, extended the work of previous developers Lempel and Ziv. Sperry Corporation was granted the U.S. patent in 1985. Sperry and Burroughs merged in 1986 to form Unisys, thus Unisys became the owner of the Sperry patents. »
[^] # Re: Unisys ?
Posté par Antoine . En réponse à la dépêche Vers une licence libre européenne promue par la commission ?. Évalué à 7.
Plus exactement, c'est l'algorithme de compression LZW utilisé par GIF qui était breveté :
« LZW was described by Terry A. Welch in the June 1984 issue of IEEE's Computer magazine. Unisys held, and still holds a patent, on the procedure described in the article, but the article describing the algorithm made no mention of this. Welch, a Sperry employee, extended the work of previous developers Lempel and Ziv. Sperry Corporation was granted the U.S. patent in 1985. Sperry and Burroughs merged in 1986 to form Unisys, thus Unisys became the owner of the Sperry patents. »
http://www.sitepoint.com/article/case-study-humble-gif(...)
Il y a, je crois, une version non-compressée (donc pas soumise au brevet) du format GIF, mais son intérêt est bien entendu réduit...