History buffs could frown on a number of details here. One being that while preindustrial paper was technically speaking indeed made of vegetable matter that took the form of recycling old plant-fiber textiles (hemp, linen, cotton) - modern-style wood pulp paper wasn't invented before the mid-1800s and required steam-powered machinery. Another being that the manufacture thereof would be highly unlikely to fall under pre-existing craft guilds and far more likely to simply be incorporated as a new one - there was no such thing as "excessive specialisation" in the Medieval guild systems.
Also, for the record, "patents" in the modern sense of "intellectual property rights" were first introduced in a very early form in Venice in the mid-1400s. In practical terms the closest equivalent was simply the de facto monopolies organised guilds exercised over their specialties in their cities, ie. entirely localised. This was also why "craft-mysteries" were a thing - the only way to try to monopolise any advanced technical know-how was to restrict access to it to people in whose interests it hopefully was to not spread it around, such as locally resident guild members of at least middling rank who could reasonably be expected to not pull up the stakes and go do their thing somewhere else.
But if any then did there generally wasn't very much the guild could actually do about it. For one example, during the English Civil War (1642–1651) a expatriate swordsmith from either Solingen or Passau (IDR which, don't have the reference on hand) - long-famed swordmaking centers in southern Germany - set up a manufactory in England and put his skills to work supplying quality blades for the combatants. The guildmasters of his home city were predictably aghast at their "trade secrets" being so flagrantly leaked and went so far as to put a price on his head, but as far as is known nobody ever actually tried to collect on the bounty and the rogue went about his flourishing business quite untroubled.
Which rather illustrates the starkly limited geographical scope of the influence of even prominent and important guilds, and why IP protections worth a damn had to come from first organised territorial states and later on agreements between those - actors whose reach didn't stop at the city gates.
And that's just the actual practical crafts producing concrete items. Intangible goods, ideas and stories, had even less protection (read as "none whatsoever") which is eg. why Cervantes eventually wrote a sequel to Don Quixote where he "torched the franchise and ran" so to speak - he got tired of sundry imitators penning shitty hackjob sequel stories and wrote a conclusive ending which unambiguously ended the eponymous hidalgo's adventures.