Someone posted last month that they found a box with some strange items in it and they thought it was a spell. This gave me an idea that I've not read any books about: If you find a talisman, or are the recipient of a spell, could you find the intention and solve the caster's spell?

Example, I find in my house a talisman with an E an X and an O on it. Could I determine what the intent of the spell was, what hour it was made under, what phase of the moon, etc... and in essence nullify the talisman?

I guess there are other ways of doing this... but it's just a what if.