Riverbend,
PPAP has a defensive and an offensive strategy. As a supplier you should look at a defensive strategy (for example protect proprietary information). Your customer might want to know everything.
PPAP should give your customer confidence that your company can produce parts that meet all the requirements, but also give your company confidence that its intellectual property is protected.
When you are looking at PPAP training, see if the training includes what I mentioned. My impression of the PPAP training at AIAG is that it takes the customer approach.
Your customer requested a level III PPAP, but do not give the store away (such as full copies of
DFMEA,
PFMEA, control plan or work instructions). It would be OK to make these available at your site or at your sales office only.