If you read the TOS of many products / vendors it will specifically say not to use their product / brand name keywords in PPC campaigns. SEO wise they don't care, but when it comes to PPC they don't want Affiliates reducing the profit margin and increasing cpc costs of their own brand bidding advertising campaign.
There are product owners that don't care if you do brand bidding, but its best to check if that's the case.
Some Affiliate networks like Moreniche, market health etc have a ban on brand bidding for every product they run. Click bank leaves it up to the product owner, for example Resurge specifically bans brand bidding, its in their TOS.
It only takes a minute read the TOS or shoot an email to the Product owner to find out if its allowed or not.
