Contract drafting guru Ken Adams has a non-disclosure agreement template that is (in Ken's words) "way better than anything else out there. And I wager it’s way better than anything a company could create on their own or have a law firm create."
Ken explains the steps needed to purchase this – a process Ken describes as "custom-commodity drafting":
In US: must be an attorney licensed and in good standing in any state, territory or DC.
Outside US: must be a lawyer or equivalent (eg counselor, barrister, advocate, solicitor), duly educated and licensed/accredited and in good standing.
As a general rule, experienced and currently practicing lawyers, and those in the legal academy, are more likely to be admitted.