I admit that it feels strange to freely disclose legal text that you've grown quite proud of over the years. It's your IP, your know-how, your craft. You feel like you are somehow giving away a piece of you, and for seemingly nothing in return. I actually hesitated a bit before volunteering the legal text in this query, or in this one.
But here's the lesson I've learned from Redline: I am not my legal text, but the counselor and advisor behind it. My years of accumulated experience and wisdom cannot be reduced to a mere indemnification clause. I share what I consider to be extremely valuable legal text on Redline because I know that I'm never as good as I think I am, and that there's always someone who can teach me something.
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 are more likely to be admitted.