i think this article has been posted here before. imo it is absolutely nothing to worry about, because cannabis has been illegal for the better part of recent history anyways. so who cares if you're infringing some suits patent? i certainly won't. and i'll definitely still be gifting and trading my creations all over the internet
what you really need to worry about is monsanto sneakily releasing genetically engineered cannabis which will automatically make any plants it's bred into sterile after the 20th generation or something... long enough for it to spread far and wide before people realize whats happening.. or some other dastardly plan which makes them the sole source for cannabis seeds and forcing you to re-buy them every season
breeders could look in to applying for plant breeders rights, although not sure if cannabis would qualify or be approved edit: it looks like it is possible, someone in canada was granted rights over a strain listed as Big C
"To be protected, the varieties must fulfill certain conditions, like showing the variety is new, different from all other varieties, is uniform, and stable ......Once accepted, the holder of the claim can have exclusive rights to sell and grow the specific breed/strain for up to 18 years, as well as the right to authorize others access to this access."