I guess I missed all of the "spell scroll" references when I read all of this. I do not recall reading anything that said Spell Scroll. So far, the only example has been a scroll of protection. Are there others? And if not, why didn't the rules just say scrolls of protection?
So tell me if I have this straight. There are "magic items" called scrolls that anyone can attempt to use. Then there are "spell scrolls" not meant as magic items per se, but as a spell in ready form to use by someone who wrote it? In which case, as long as that spell is in my list, I am good to go. Would I roll an INT check for a spell scroll? Is there no difference between arcane magic and divine magic in this case?
"Scroll" is a category of magic item, just like "ring" or "wand." The general category of scrolls has very few restrictions of use: you just need to be literate in some tongue in order to read it.
However, there is also a specific magic item, "spell scroll". If "scroll" is like "wand", "spell scroll" is like "wand of lightning bolts" - it's a specific example of a general category, and just like the wand of lightning bolts is more limited in its use than the regular wand category, so are spell scrolls - in order to use a spell scroll you need to have the spell in question on your class list, and if you're too low level you run the risk of messing up.
You don't need read magic to understand a spell scroll, you just need to be of the right class. If you want to copy it into your spell book, you need to succeed on an Intelligence (Arcana) check with DC 10+spell level (a restriction on that particular item) and spend 2 hours and 50 gp per spell level (because that's the cost in time and gold to copy a spell into your spell book).Here, and I thought this was going to be easy. Ok now I am wondering. How does a wizard copy a spell scroll into t his spell book? I have not seen the spell; read magic.
If you're copying a spell from another spell book, you don't need to roll Arcana, just spend the time and money. I view this as the difference between getting a ready-made meal (the scroll) and getting a recipe (the spellbook). If you have the meal, you can take it apart and try to figure out how it was made, but you might fail in figuring it out - or, you could just enjoy the meal as it is (cast the spell from the scroll once and then be rid of it). But if you have the recipe, there's no problem in figuring out how the mean is made (how the spell is cast) - it's all right there. You will still have to make the meal yourself if you want to eat it though (cast the spell to get any use out of it).