Over the magic cafe', some magicians offer their lecture notes for free from time to time ( Steve Youell did sometime ago ). I know a very good and knowledgeable magician over youtube who shares his trick ( a very good one actually ) after he checks your profile and you add him to friends ( to show private videos ). Plus, many magicians offer part of their lecture notes on their websites as a kind of "promo", or a sample, or newsletter. These are my observations. There is nothing with teaching your effect to others in magic community ( as I concluded from my observations ), but you will be under the same ethics as publishing a book/DVD, if not more restricted. Can you share it in this very forum? I have no idea on forum rules here. I'd ask a moderator.