Say I have a ring of Counterspells or comparable protection from a greater dispel magic spell.
Could someone circumvent the blocking by using an area dispel version of greater dispel to not "target" the creature with the protection and dispel a buff affecting a creature?
For - The person affected wasn't targetted and isn't trigged because the spell wasn't cast on the wearer, rather the area they're standing in.
Against - The spell AFFECTS the creature, and thus is cast on them.
What do you think?
The area version of the spell wpuld not be counterspelled by the ring as it does not target the wearer, however only the targetted version allows the caster to target specific effects which is what your talking about preventing. Keep a high level buff on you at all times, like mind blank for example, that you don't mind losing and your golden.
Unfortunately though there is no actually way to wholely prevent it, keep nondetection up and hopefully they will not recognise your ring.